Hun, you're in a very bad place. The angst you feel is probably the Xanax leaving your system or cravings. I'm two months sober and it sucked so bad at first but I'm no longer a slave to addiction and I'm proud of that. You have a lot of your plate with school so I'm sure you're stressed. I really don't know what to say since you admittedly don't want to quit. Xanax or any benzo is a nasty addiction. I really do hope you find the want to quit. Maybe push school back a bit and go to rehab? There they will teach you the tools to get past these cravings and live a sober life. I wish you the best