I've heard some people use propranolol to help with their anxiety for things like this as well. I used to drink before interviews as well, I've also tried xanax, and shit sometimes even a combination. It helped me get through them at the time but I don't know how overall helpful it was.

I recently went through the interview process as a sober guy and found that while I did get anxiety, it was a more healthy anxiety and not a crippling one. I'm on a low dose of an anti-anxiety medication (Buspirone) which I think helped; though I attribute it mostly to a better overall healthy state I've been in due to consistent exercise, healthy eating, and sleep. Not a super sexy answer outside of maybe the medication part.