everytime i sit up straight i feel a pulling sensation extending from the top middle of my chest all the way down to my upper abdomen. it pulls more when i breath. i always burp too. this have been going on for about
a month now and im tired of it. i went to the doctor. they checked my heart, chest xray, and blood count all normal. the sensation that i feel is not pain, its just a weird pulling sensation in the middle of my chest, left shoulder/arm and my upper back. someone help please.