Stop fighting your anxiety, it only makes things worse. Instead, surrender to it, accept it for the time being: do the exact opposite of what you've been doing until now.
Ask yourself, did fighting make you feel better? Did it cure you of panicky feelings, palpitations, upset stomach, feelings of doom and all the other symptoms in the Google guide to anxiety disorder? On the contrary, all that extra adrenaline your body released as a result of the extra stress and strain of fighting only made your nervous system more sensitised still.
If you're digging yourself into a hole, the best thing to do is stop digging. Stop fighting - stop checking your pulse every 5 minutes, stop testing to see if you can walk round the store without feeling dizzy, stop checking that ache or pain to see if it's gone away yet. Instead learn to co-exist with all the symptoms, accept them without reservation and acknowledge they're going to be around for some time yet - but you've made important changes in how you deal with them that eventually and inevitably you will be free at last, free at last, free at last.
The woman who cracked the anxiety code once wrote: "I find that some patients complain , 'I have accepted the churning in my stomach but it is still there. So what am I to do now?' How could they have accepted it if they still complain about it?
"I try to make them understand that they must be prepared to let their stomachs churn...only by so doing would they be truly accepting. In this way, and only in this way, would they reach the stage when it would matter no longer whether their stomachs churned or not. Then freed from the stimulous of tension and anxiety, their adrenalin-releasing nerves would gradually calm down and the churning would automatically lessen and finally cease."
Doctor Claire Weekes, 'Self help for your nerves", 26th edition, 1996.
Learn to let go and you will recover.
