I think I am anorexic (help?)?

I am 5'2 and 87 pounds. because of weight fluctuation throughout the day, sometimes my weight hits 90, and when that happens I don't eat for the rest of the day. Even when I stay at a nice 86-89 pounds, I eat between 400 and 600 calories per day. I realize that this is kind of unhealthy, but I don't know what to do about it. I dont look super skinny, in fact I wish i was thinner. I know that there are places to go for help, but I don't want to be a burden on my parents. Any suggestions?