Re: Could this be anxiety?
This sounds truly awful. All I can say about it not feeling like anxiety is that if it doesn't FEEL like anxiety in any way it probably isn't. That's just my two cents, however. There may be others that disagree with me on that. All I know is that as an anxiety sufferer - I know it's anxiety. What I never know is if the weird neurological symptom is caused by something else or the anxiety. But the anxiety is always very apparent.
I would keep seeking help until you find someone that will truly listen. Perhaps you have a severe magnesium deficiency? With a western diet, almost everyone, even young people, are very deficient in magnesium, and although I am no nutritionist - I have read that magnesium deficiency causes many weird neurological symptoms.
Good luck - I hope that you are feeling better!