I would respectfully suggest that not only is the inherent economic power imbalance at the heart of a job interview the cause here, but it's also an indicator of a deeper issue, that being a latent social anxiety that may be hiding deeper down. It just takes a more exacerbated situation to bring it out (thankfully!). Some of us have it in a more pervasive sense that overrides every aspect of our lives that cripples almost everything we do (or rather, don't do as the case may be) and I'm happy to see that's not the case with you, but still, the same treatment options used for those of us with serious social anxiety situations may be useful for helping to get you through this current situation.
Xanax, from what I've heard, can be extremely addicting so I don't really recommend that stuff. One doctor I saw told me that he NEVER prescribes it unless the patient is terminally ill - and that patient was my dad with terminal brain cancer. Was a massive help for him. I'd never touch the stuff myself after that conversation. But there are other options. There's Paxil (see other comment), and even blood pressure medication can be used off-label for anxiety (propranolol is what I'm on right now and while it's not nearly as effective, it does help a little bit).
Anyway, the point here is that the condition you may or may not have is irrelevant, your doctor is the one who should be making that call, and whatever tools they've got for treating social anxiety may be useful for you here as well. You may not need to stay on them long term at all - you can assess that later on after the economic uncertainty has passed. But for now, if you can swing it, I strongly suggest seeing a good doctor to help you have some better options beyond a glass of wine.
But if you can't, then hey, again, no judgement. Gotta do what ya gotta do.
