Same problem
Full time online, full time gf, full time school.
If you are not at a VERY good university program, drop out of school! I was going to drop out last year but I have only this year and one more to go and its one of the top biz schools here in canada, so it may come in handy one day.
Try taking a vacation. Go somewhere warm
When you get back you will be twice as productive.
If you feel VERY weak cause of little sleep, drink more coffe, coke, or take a fat burner to speed up your system, jus be careful with those.