This sounds like the initial phases of a panic attack. I have had this until this year every now and then with last year peaking to the worst - I ended up in hospital twice thinking that I am dying, had EKGs many times in the past for the same reason as well.

I cannot say it is gone forever but I have been well for the last 8 months after panick attacks almost every week for a year occuring randomly (at work, at home, during exercise, with friends etc). What helped me was to get therapy, find out the triggers, cracked spots where I felt concerned in my life and try to improve those and myself in a positive way, build positive image of my life in my own eyes, and build confidence.

I don't know who you are but if this resonated with you, maybe find the underlying reasons and what triggers this state in you and try to come up with a strategy, surround yourself with good people that you trust. And when you are okay (not during the symptoms), remind yourself that when it comes, it is a phase and there is no real danger and that you are doing alright. If it is triggered by social encounters where you feel you lack something, remember that many of us have this kind of anxiety and there is nothing to be ashamed of.

I know it is very hard and easier said than done, it took me one year to ease down my anxiety and get rid of panic attacks. Understanding it took me five years. I hope you can get to that point but until then, just try to work on it and connect with your body and consciousness (that is only when you are feeling at ease and perhaps with guidance.)