Don’t sound at all heart related. Lay on your other side and get some sleep and don’t worry about it.
I think you can relax, pain that is positional in nature is very rarely if ever related to your heart.
I know the uncomfortable feeling you mean, but i've had a chest drain in the area. So it may be nerve related. Straining a chest wall nerve can cause severe pain or discomfort. I've had to have an ER Visit from straining a Left chest wall nerve before, the pain was so severe I thought it was a heart attack.
hello . I'm having similar issues myself, although mine stays with me standing up, yours sounds like gastro to me. did they do a upper gi?