Can I take xanax the night before surgery?

Tomorrow is bbl revision. I have anxiety at times so take xanax. Flew to Mx in Dec and was very anxious as I hadn't taken Xanax in along time due to changing doctors. While in Mexico I saw a dr and he prescribed me some for the plane ride home, but their pharmacy bottles don't have patient names like here. I don't want to take it and it affect my surgery date because I can't show the script is mine? Makes sense? But I don't want to be up worried sick about my surgery & break myself out in hives