I can understand why you would be overwhelmed with all of the issues you are facing and I would love to give you some pertinent information that I think can give you some clarity on where to head from here. First, as someone with chemical sensitivities, it would be great if you go with a mattress that has been tested for V.O.C.s (Volatile Organic Compounds), since it really comes down to what is off-gassing from the mattress. Organic mattress can still have V.O.C.s like Formaldehyde, so testing is still essential for you situation. Greenguard Gold is the highest level of certification that has even double the standards of CertiPUR-US, so that will be what you want to look for with the mattress you purchase. It also helps if you go with all U.S.A. components, since overseas materials don’t have the same standards in terms of both quality and environmental concerns.
Regarding the Sciatica and back problems, to address that, you have to look at how the spine is aligning when you are in your sleeping position(s). As a Chiropractic doctor and mattress designer, I done extensive testing over the years and it is what lead me to create the Mattress Checker App., which is the first tool for objectively measuring spinal alignment while on a mattress.
The problem I found with most most mattresses (latex included) is that the heavier mid-section of the body is not properly supported, thereby allowing your spine to go into a hammock type of position. Without enough support in the mid-section, it is likely your spine is being placed in a poor alignment position throughout the night and that will cause uneven pressure that can result in aggravating and over time even causing spinal and other musculoskeletal conditions.
To verify this, I came out with an App. called the Mattress Checker that allowed me to test hundreds of customers over many years, in order to find a solution to how to properly correct this. If you want to check your alignment, you can download the Mattress Checker App. for free in both Apple and Android devices (Mattress Checker App | Back Science™ Bed - The Bed That Has Your Back™ ).
That said, the mattress that I developed called Back Science was created to solve these types of issues. The Back Science mattress offers more structured lumbar support through its double zoned patent pending Lumbar-Flex interlocking support which is intended to maintain the spine’s alignment and preventing the lower back from sinking too deeply, which can lead discomfort and potential back problems over time. A recent Trust Pilot 3rd party survey showed that 97% of Back Science users experienced an improvement with their back pain. Additionally, that same survey showed that 96% of those surveyed found the Back Science mattress cooler than their last mattress. That can be attributed to the Back Science patented Airflow Transfer System that allows up to a 100 times more breathability, as well as the cooling Hypergel surface.
Lastly, with Back Science there is also a full 365-night trial that allows for free customizations if needed to first try and solve the issue before returning or exchanging the mattress. That is an extra part of Back Science’s success, though the majority of Back Science users love the way the mattress performs without any modifications. If modifications are needed, it is a simple exchange of comfort and/or zone layering via UPS that can insert into our proprietary GripLock modular cover system.
Feel free to let me know if you have any questions whatsoever or I can be of further assistance and if you do purchase a Back Science mattress, be sure to use The Mattress Underground discount code we offer to members: TMU10 for an extra 10 percent savings.