Personally, I just black out and can't remember what happened the night before, but my friend Mike is another story...He doesn't have anxiety but somehow obtained a prescription for xanax which he completely abused.
One time we were at a birthday party, he was hammered and I caught him alone on the couch with his prescription of xanax in his hand, secretly slipping them one at a time into his mouth. I took the bottle from him and hid it and he forgot about it for a while. About thirty minutes later another friend came up to me and said I should call Mike a cab, he's getting pretty rambunctious and I'm the only one he'll listen to, so I do. When the cab shows up I walk him outside, buckle his sea tbelt and give the cabbie his address. Sure enough, about twenty minutes later I get a phone call from the cabbie (because I ordered the cab with my phone, not Mikes) and he is FURIOUS. Apparently, when he got to Mike's house, Mike refused to pay him and threatened to "shoot him the back of the head" and some other random threats. I apologized to the driver and assured him that Mike was completely harmless, but was completely embarrassed none the less.
Another time, not even a week after said birthday party, Cinco de Mayo actually, Mike was up in Boulder on the campus, celebrating the holiday. One thing led to another and he decided to leave the party he was at, and ended up wandering around campus. I wasn't present, I had to read about it in the newspaper the next day, but it went something like this: While wandering the campus, Mike randomly attacked a student walking down the street. Just jumped him, hit him once or twice and moved on. Next, he threw a rock through one of the dorm windows, and when the RA came to investigate, Mike choked out the RA. Mike takes off, running through campus and the RA calls the cops. They come to look for him and find him hiding under a tarp on the quad. When they approach him and finally get him into custody, he fights tooth and nail, spitting on the cops and telling them that he will "have their jobs!". Trying to put him in the ambulance, they had to use 4 point restraints...He woke up in the medical ward of Boulder County Jail with NO idea what happened.
I would post the link to the news story in the Boulder paper but that would invade his privacy. Luckily, his daddy makes enough money that he got him a good lawyer, and his charges will most likely be dropped to misdemeanors. And he gave up the xanax, thank the lord.