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I can relate to a lot of your issues. I use a medcline shoulder pillow.
It solves four issues for me 1)shoulder pain is gone since my shoulder isn't mashed into the bed, 2) neck pain as my neck is level, 3) Acid reflux from being slightly elevated, 4) sleep apnea since being elevated opens my airways. Ymmv, but might be worth a try.
Oooh wait is it like this? The other wedge ones look like you'd just be kinda on top of it, but maybe the memory foam sinks in some. Do you remember what the specific brand or type was?
(thank you again for this suggestion by the way!! I didn't know this was a thing!)