Hi chloe41,
Unfortunately I can’t feel what you feel or see you on the mattress so any help I can provide would be based more on “educated guesswork” than anything else but even for this I would need a great deal more information than what you have provided to be able to even guess at what may be happening. This would normally need a more in depth conversation that can go into much more detail and ask more “nuanced” questions but of course this isn’t possible on a forum so the “next best thing” would be much more detailed information on the forum.
There are many reasons that people may experience any specific “symptoms” they experience on a mattress, some of which may be connected to the mattress itself and some to other circumstances or health issues, and trying to “diagnose” the underlying reasons for discomfort or pain can involve some detective work and trial and error. It can be much like trying to “diagnose” a medical issue over the phone when there are many possibilities for any specific “symptom” and where “theory at a distance” can never be as reliable or accurate as an actual visit to a health professional’s office where more specific information and testing can be used to assess what may be happening.
Having said that … post #2 here and the other posts it links to may help you to assess what may be happening and provide some ideas or suggestions that may be helpful.
While your experience isn’t common and the large majority of people are happy with the mattress purchase they make … there is also a smaller minority where choosing a mattress that is a “perfect match” for them is a much more challenging process either because the mattress isn’t the ideal design for them, they do better with different combinations of materials or components than what they purchased, or because of other factors such as health issues or because they are unusually sensitive to smaller differences between mattresses and are more on the “princess and the pea” than the “I can sleep on anything” side of the range. Sometimes there can even be some more “hidden” reasons such as the choice of pillow which can have a significant effect on shoulder or mid back pain or discomfort.
If you can provide more details about your body type and sleeping positions, the specifics of your mattress and the combinations you have tried, and describe your specific experiences and with each of them and any differences in your symptoms with each one in a little more detail (especially whether you are looking to change the comfort/pressure relief, the support/alignment, or just the “feel” of the mattress), the specific “symptoms” you are experiencing (pain, numbness, discomfort, etc), where you are experiencing any symptoms, which sleeping positions you tend to experience them, and whether they tend to happen when you go to sleep at night or when you wake up in the morning, I would be happy to see if I can identify something that may be helpful. It would also be helpful if you could provide more information about any sleeping issues you have had in the past or on other mattresses that may be relevant as well.
Phoenix