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Unfortunately there are far too many unknowns, variables, and different possibilities involved to be able to make any specific suggestions based on specs (either yours or a mattress) or “theory at a distance” It is not possible to “diagnose” any symptoms you have on an online forum based on the limited information that you offered as this is would need a thorough in-depth analysis that involves you doing some detective work and incrementally narrowing down the cause of your restless nights and shoulder pain.
I can certainly make a few general suggestions that may help in tracking down some of the possible reasons for your pains in the hope that you can use this as a learning curve for your next system. I suggest that you first try to understand your sleeping landscape and where your symptoms originate and do a little bit of local testing before you rush into any online purchase.
Shoulder pressure points and pains while sleeping on your back can come from a mattress that is too firm and puts direct pressure on the shoulders, the shoulder blades, or on the back muscles and can also cause soreness or numbness and tingling in the arms or can often come from postural issues as well. There is a bit more information about sleeping positions and posture this in this article here .
I would also closely look into the pillow issue The pillow that works best for you can vary with different mattresses depending on how much you are sinking into the mattress and the distance between your head and neck and the mattress surface. Upper back issues can also point to a pillow that is either too high or too low for your body type or sleeping position and doesn’t maintain the gap between your head and the mattress and keep your head and neck if good alignment over the course of the night which can affect the upper back as well.
As you seem to believe that you need a firmer mattress I would recommend that you have a detailed discussion with any of the companies you are considering purchasing from whether is BB, Helix or whether is a foam product or an innerspring product and let your advisors help you out.
I am not very sure what you mean by this and what is it that you are asking here.
Without understanding the basis on which you make any of these choices is almost impossible to make any suggestions. It seems that a lower budget range is an important part of your personal value equation and while I can certainly help with “how” to choose … It’s not possible to make specific suggestions or recommendations for either a mattress, manufacturers/retailers, or combinations of materials or components because the first “rule” of mattress shopping is to always remember that you are the only one that can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved that are unique to each person to use a formula or for anyone to be able to predict or make a specific suggestion or recommendation about which mattress or combination of materials and components or which type of mattress would be the best “match” for you in terms of “comfort”, firmness, or PPP (Posture and alignment, Pressure relief, and your own Personal preferences) or how a mattress will “feel” to you or compare to another mattress based on specs (either yours or a mattress), sleeping positions, health conditions, or “theory at a distance” that can possibly be more reliable than your own careful testing (hopefully using the testing guidelines in step 4 of the tutorial) or your own personal sleeping experience (see mattress firmness/comfort levels in post #2 here).
I’m not sure what you’ve read since you found the site but just in case you haven’t read it yet … the first place to start your research is the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that can help you make the best possible choice … and perhaps more importantly know how and why to avoid the worst ones.
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort”, firmness, and PPP (Posture and alignment, Pressure relief, and your own Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists based on all the parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase if your choice doesn’t turn out as well as you hoped for).
Nobody but yourself can speak as to what the “best” mattress for you as you are the only one that can feel what you feel on a mattress and what is “best” for you can be the worst for someone else with different needs and preferences. I cannot speak as to how any specific mattress will “feel” for someone else or whether it will be a good “match” in terms of comfort, firmness, and PPP because this is too subjective and relative to different body types, sleeping positions, and individual preferences, sensitivities, and circumstances and you are the only one that can feel what you feel on a mattress … outside of PPP (which is the most important part of “value”), the next most important part of the value of a mattress purchase is durability which is all about how long you will sleep well on a mattress. This is the part of your research that you can’t see or “feel” and assessing the durability and useful life of a mattress depends on knowing the specifics of its construction and the type and quality of the materials inside it regardless of the name of the manufacturer on the label or how a mattress feels in a showroom or when it is relatively new so I would always make sure that you find out the information listed here so you can compare the quality of the materials and components to the durability guidelines here to make sure there are no lower quality materials or weak links in a mattress that would be a cause for concern relative to the durability and useful life of a mattress before making any purchase.
Hopefully this information helps to give you a good start in pinpointing your issues and your mattress research.