I'd like to start by saying I don't have extreme anxiety. It's mostly social, since lockdown and being a bit more isolated, I found myself panicking back at work in some social situations. Blushing constantly when someone just spoke to me (very obviously too!) It was getting ridiculous.
After a quick Google I thought I'd try St John's wort.
What a difference!!! I still have a slight worry about some social situations, and I'm by no means a social butterfly, but I've stopped blushing and I often think afterwards oooh I didn't even think about that situation just there!

It probably won't work for everyone, and might just be a placebo, but either way you should give it a shot if you haven't already!