Oh yes, I can so relate to this.

I had MASSIVE anxiety issues between 1998-2006, I couldn't even walk past a hospital or doctors surgery without being overcome with fear. I was rushed to hospital twice with suspected heart attack only to be told my heart was fine, once I even went into shock.

In the end I stopped running from it and actually faced it. Everytime it crept up on me I just turned and faced it and said, OK, give me a heart attack, I don;t give a ****. It worked after about a year of doing that, amazingly!

I didn't let it get me up from where I was and just let the adrenaline run free around my body and I get thinking to myself "do what you like, I know your wrong, kill me if you want" and it worked!

Good luck