Everytime I take a deep breath in, my heart thumps in a really noticeable way and it sends me into panic thinking my heart is about to stop beating.  I've taken an echo for a seperate problem which came out normal so I don't know what is going on. I couldn't find anything about it on Google and I was just wondering if anyone else has experienced this. 

I cant focus on anything, I'm constantly stressed about my health.