This first happened to me a year ago, and since then has occurred 4-5 times. For some reason I'll start to get chest pains, usually around my left lung and heart. Then at some points I feel bubbling like when you have gas. Eventually I start to have flatulence and it is alleviated. It's pretty painful and certainly annoying. I think it's gas being blocked by something. Can anyone tell me what this is and what causes it?