Oh dude!
Im so sorry to hear about this.

Your not stupid, so Im not going to go on about how alcohol isn't going to make things better, only worse....

Just try to keep yourself occupied, start going to the gym if possible...maybe take long walks....just find ways (hobbies) to keep you occupied and keep your mind off her. Try doing somthing you wouldn't normally do!

I dont know what else to say dude,
I wish you the best of luck!!

Take Care
Az.