Is it really depression? ?

I think it could be because of the bulimia that you definately have. Breaking up will also cause you to feel depressed, but I think you are throwing up more because of the breakup. You should see your doctor though. I am also bulimic and I throw up mostly in the evening as I dont like going to sleep with a full stomach. I have been like this for years. Bulimia affects your hormones and can definately make you depressed and worthless. Its a control thing for you, but you must seek some help. Never mind your friends hun, get yourself sorted.