Not sure whether i'm bulimic or a purging anorexic?

I know that i have always had problems with food, i am 17 and seeing a range of people due to my circumstances as i make myself throw up, and if i dont i "excessively" exercise.
I'm just just quite confused and wondered if anyone could clear things up for me as before i went to find help from a counseller at school who then referred me to this clinic i regularly go to, i read online what symptoms bulimics had to see if that was what i was suffering from, but they always said that the purging followed a binge. I thought i binged if i ate like a chocolate bar of about 150 kcals and a couple of biscuits, and would then throw up, but from what i can gather a binge is consumption of ALOT more then that.
So since i calorie count and have about 500-600 calories daily, and then aim to get rid of 400 ish through exercising, whether i would be classed as bulimic or purging anorexic?
The lady i see at the clinic says that i am losing too much weight too fast, but i still consider myself chunky and honestly think that i am verging on overweight, so if you have any information for me please reply as i am very confused.
Thanks