get help!, it will be seen as a disability (mental) I suffered with bulimia for 4 years upto very recently, Im managing ok on my own, as like you say I never thought it was severe enough however it ruined my education and life for 4 years and totally wrecks your body metabolic damage, By finding out about metabolic damage and how it actually makes you fatter easier I just stopped as it defeated the object of why i was bulimic in the first place, to control my weight and be slim.
If i could go back I would get help. Good luck, im training to be an early years teacher at the moment, similar to pgce and I am struggling with alot but managing to not slip back into purging. Get help, get support, it will be worthwhile and you will not be thrown off the course.