Eating spurts- smell of food makes me sick?

So. I'm 16. And no I haven't seen a doctor but my question is does anyone go through eating spurts. I binge eat sometimes. For a few weeks I eat and eat and love food and then after a while feel bad about it and kind of obsess over skinny girls. I'm not all that fat, I mean I'm chubby but. Anyways. For weeks I'll eat and eat right. Normal, three times a day. Then, other weeks, I don't get hungry. Like at all. I eat once and force myself to eat twice (maybe). And the smell and sight of food makes me physically sick. Like gagging sick. What. Is. Wrong. No, I'm not pregnant I'm not sexually active at the moment but. Help? Thanks