I'm really concerned about this chest pain I've been experiencing since September 2016. It's deep on the right side of my chest, and it's not sharp, but more like a burning sensation. It feels like there's this big hollow hole and sometimes it feels like something's writhing or like a contracting muscle in there. It's at its worst when I'm sitting up. The only time I feel a bit relieved is when I'm leaned back at least 45 degrees or lying down. Ive noticed it gets worse on days I dont get enough sleep, but it doesnt seem to be affected by food or anything else. I don't have trouble breathing, exercising, or sleeping, but this feeling is constantly there throughout the day. Sometimes it's so intense I have to pause everything and lie down. What could this be, and what should I do about it?