Anxious over nothing/really small things, any advice??

Hi, I've always had issues with anxiety but it's at a high at the moment and it's hard to even function.

I am lucky enough to have no social anxiety, but my anxiety is set off so easily and it's impossible to calm down when I do get anxious.

Usually it's over really small things, such as someone saying one slightly negative thing, any sort of criticism stresses me out so much it leaves me "frozen" for days. Also the thought or task of having to respond to people or call the doctors. I'm not anxious while doing it only thinking about doing it.

When I do get anxious, I cant sleep at all unless it's out of pure exhaustion. So I'm always physically exhausted but have to force myself to go out places to be able to sleep.

I fluctuate between not eating for full days, then eating absolutely loads and throwing up.

On my worst nights I have a bit of alcohol to calm me down, but I hate doing this because I know this is how addictions start.

Ive had therapy in the past but unfortunately it hasn't worked all that well for me.

Not looking for a diagnosis or anything, just generally any tips to deal with anxiety while im waiting on seeing a doctor. Anything is greatly appreciated, thank you x