Sorry to hear this! Have you tried going back to your GP and see if he would give you anti-anxiety meds? It might help. Good luck :)
I don't believe it is anxiety though. I have suffered with anxiety my whole life and been on and off medication and it has never felt this awful. Even on medication my workouts were extremely limited due to the rapid heart beat and the palpitations. It seems that anytime they check for something the symptoms hide away. I am very scared I am going to go into cardiac arrest any day now because no one is listing to me or taking me seriously.
You *are* being taken seriously. The amount of testing you have undergone is clear evidence of that.
The problem is that you cannot accept what skilled, caring medical professionals are telling you.
Bearing in mind that doctors have no reason to blow off patients who are genuinely ill (after all, a patient in treatment represents income), it would be a good idea to see your counselor to find out what your logical next step would be in dealing with your fears.
I do believe I have anxiety, but i do not believe this is related, i cannot work out and my heart beats very fast, feels like it is fluttering and I am extremely dizzy constantly, my breathing is also quite weird - especially after sleeping or working out.
You are describing classic symptoms of panic disorder. I suggest you discuss this possibility with your counselor.
sounds like panic/anxiety to me. I hate calling generalized anxiety "anxiety" because some folks think this means the type of anxiety you can control or is the result of an outside stimulus. It's not.
My body was triggering all physiological responses of a panic situation (adrenaline dump so fast heart, palps, dizzy, weird thoughts..all out of the blue), I wouldn't understand why, get scared, and there's this crazy feedback loop.
It gets fixed with cognitive behavior therapy, lifestyle modifications, and certain meds if you need them.