Bach Flower Remedies may help, the drops or lozenges, even chewing gum really hard will take your mind off the way you are feeling.
I say to myself when floating anxiety and symptoms start, that I have felt like this before, had the same symptoms before, and nothing happened and I am still here, so it can't be serious.
Don't try to fight it just go with it, don't give it any power and the symptoms will start to abate, concentrate on doing something else, because it is you promoting the symptoms, no one else.
It does work.