Hello and welcome to HW. It sounds like a panic attack.
A panic attack is a sudden episode of intense fear that develops for no apparent reason and that triggers severe physical reactions. Panic attacks can be very frightening. When panic attacks occur, you might think you're losing control, having a heart attack or even dying.
I think your attacks warrant a visit to your family physician to talk over your attacks with him/her.
Also coming here and talking with us was a very brave thing to do so you are on the right track.
Hope you stick with us,