I'm sorry I don't think I would have any insight into what your (former) friend's motives may have been in all of this. However to my mind the moral of this story is that, more often than not, booze brings out the worst in people. And it sounds as though it did in your former friend's case. (If you're taking medication for depression & anxiety you shouldn't be drinking anyway.) My suggestion would be to file this experience under "lessons learned" & avoid putting yourself in this kind of situation in the future. I'm glad you made it home safely in the end.