So sorry to hear about this happening to you. A similar thing happened to me at the end of last year and like you I found myself strapped to a heart monitor at the Dr thinking I was having a heart attack. Just to be told it's a panic attack and I've since been diagnosed a general anxiety disorder.

It's an awful experience and a tough road but it can be managed and overcome. Writing and Steemit is one of the things I use to help. Writing is healing for me and has helped me work through all sorts of bottled up issues.

Wishing you all the best xxx.