I'd go get checked out. Probably just the way you are sleeping, but for your own peace of mind and the ones that love you, go get it checked....
Do you think any of your medications may be causing this? Some medicines have side effects which give weird symptoms, sometimes.
omg i have the same thing , i can walk stairs or treadmill and not get the feeling i get on walking up a very small hill, have been so concern its my heart, i had a echo and stress test done last month they said it was ok, but my upper back and my left arm and my chest feels not normal, hurts and tight maybe not sure , it stops after i get pass the small hill and i feel find, so worried its heart but had test that say no, i do have rods going down both sides of my spine and its fused together from top to only 3 left on bottom not fused. should i keep pushing till i get a heart cath or believe with echo and stress test that its not my heart and its my back or gerd
do you get the arm pain after movement, exertion? Do feel short of breath. I went to the doctor because of chest pain which was really GERD. I was having pain in my left arm, it wasn't pain it was more like a burning twinge a few times after brisk walk, I could ride the exercise bike for miles, but walking uphill did it to me, I would get it checked out