I have severe anxiety. I'm on medication now, but wasn't when I was drinking.
I emphasize with you. My anxiety was so bad after one bender that I hid in the closet.
It's rough. Very rough. But, the anxiety will abate. Avoid caffeine. Get some rest, lay in bed. Whatever it takes that will help you stay calm.
I'm sorry about your doctor. I've had some real losers in the past so I know what it's like.
Best wishes to you and this to shall pass.