Maybe a nutritionist could help me out with this? Questions about fat loss.?

I'm 15 years old, 4 foot 11, and currently weigh 102. In january I weighed 128. I started out as your average dieter but I have ADHD and at night my meds wear off.. at which time I become very impulsive. I am on Adderall. Anyhow, I would do fine during the day but then I would go on nighttime binges (typical for adderall users) and I came down with bulimia. I still exercised about 2-3 times a week, but it was never on a consistent schedule. Sometimes more, sometimes less per week. I believe that I may have a thyroid problem? Like I said, I weigh 102... but I've noticed more bodyfat accumulating, especially in my thighs/butt area, and my hips/lower abdomen. I really want to lose this body fat and see my abs this summer. (I am pretty muscular underneath it all) I dont understand what's going on. Any suggestions to help me get rid of this body fat and keep my muscle? I mean, I'm not fat, but I've gained a considerable amount of fat. I think I may be what's considered "skinny-fat"? Anyhow. I will be very devoted to a specific dieting/exercise plan that will put me on the road to fitness. I'm willing to lift, run, swim, whatever. I haven't gotten the chance to get real much cardio in for the past 2 or 3 weeks though, and that fact has irritated me. Would that time period be enough for me to gain that much fat? I need tips on how to lose fat and only FAT within two months or less, that'd be awesome.