Nikigrl, please, please hang in there! I've been through some rough things, but never as much as you--you must be so scared! It's hard enough to go through problems with a disease when you know what you've got; I can't imagine how bad you feel, emotionally and physically, when they still haven't figured it out yet (but they will)!
I know it seems like, man, why can't they figure it out, but I've learned most recently that the body is a very complex machine. I recently found out I have Graves' disease, an autoimmune disease that makes you hyperthyroid. I had no idea how one little tiny organ could mess up your entire body when that organ's not working right! Things are so interconnected that sometimes it takes a while to figure out the problem. I know that doesn't really help you much when you think you're going crazy, are so miserable, and your life seems like it's turned upside down.
Do you have parents or someone else you can talk with about how you're feeling emotionally? Do you have someone to support you while you're going to all these doctors, you know, maybe go with you? If you're near a teaching hospital, you might want to consider trying to go there for some answers. Sometimes they're more up on things. Not saying your physicians aren't good, just possibly an option for you if you continue to get nowhere with your current physicians. I'm assuming when you say they checked your hormones, they checked your female hormones as well as your thyroid?
I'm sorry I don't have any answers for you, only support. Try to take each day as it comes and not worry about the next day or the next week. Stand up for yourself with your physicians. And if you can, take someone with you when you go to your appointments and tests. Let us know how you're doing. You're in my prayers.