Welcome to SR. I have no experience with coke, but a lot with Xanax. Benzos are bad news, and Xanax is one of the worst.
I quit Xanax at the same day I quit alcohol, now nearly 5 years ago, when in rehab. A double whammy, if you want. Not easy at all, but certainly doable. Ironically - but quite typical, I later learned - I now have a lot less anxiety, even though I no longer take any medication and no longer drink.
Good luck on your travels, and be careful when you finally quit the Xanax. The withdrawals can be just as dangerous as those experienced when quitting alcohol. Best to talk to your GP about it, better safe than sorry.