I am a 15 year old, 165 pound female with a history of anxiety. Recently, I have had a lot of bloating, belching, and squeezing in my left side of chest/left breast. It happens randomly and the squeezing goes into my ribs. The sensation gets bad when I deeply sniffle. Also, I have bad heart pounding and upper chest pressure when I go to sleep and wake up as of recently. My EKG in June was normal. I have been getting more bloated and breathless upon exertion lately and more tired than usual. My left arm gets really discomforted when I put it in a blood pressure cuff at the store (squeezes and hurts badly). I am so scared that something will happen to me. I have zero genetic conditions that I know of. All blood work has been normal. What could be going on! I am terrified. :(