Am I bulimic?

Disclaimer: this is a long post but I'd like any help I can get. I think I may have some form of bulimia, but I don't think its serious enough to get help. My weight has gone down about 20 lbs in 6 months. I wanted to lose all of the weight I gained from being with an abusive boyfriend after I started seeing someone who I am still in a relationship with. My boyfriend has always been supportive of my choice to try to lose weight, but constantly reminds me he loves me however I am in the present. I began with a regular diet and exercise. Slowly (about a month ago) this diet and exercise plan morphed into obsessive calorie counting and exercise. I could read about health and fitness for hours. Lately, my eating habits have changed into an "I deserve that" or "I don't deserve that attitude". I often withhold food from myself during the daytime, eating only enough to satisfy my hunger. I often begin my day with a run or walk (4-6 miles) and then as my day progresses do weight training, a HIIT workout, and/or Krav Maga class (sometimes all in the same day). At night, something overcomes me and I become a ravenous monster and take over the pantry eating thousands of calories in minutes (I know I count every calorie). My family and friends have started to see me act this way and tell me I exercise too much and need to stop.  I've kept up this routine for a few weeks now and I believe it is the cause of my missed period. Please help me understand what is going on with me. I'm terrified of being sick but I'm also terrified of being ugly and fat again. I just want to be perfect like those bikini models and for a thicker girl like me, I have to be drastic for it to happen.