Ok...so this is probably going to be lengthy, get ready!
I have no idea whats going on with me, and I just want to know if its from something serious, or something as simple as a diet change. It started when I was 16, my boyfriend and I went the fair and after riding a couple rides, I got seriously nauseous and struggled to drive home, when I got home I had really bad chills, yet my body was hot (I had no fever). I am 17 now, and we have a senior trip to Six Flags (Keep in mind I have no motion sickness nor was I dehydrated), after that trip the same exact thing happened and had to stay the night with my boyfriend because I couldnt drive home. The day after graduation (only a few days after six flags), we had a senior party, where we would go into the school and be "locked in" until 5 AM, yet AGAIN the same thing happened while I was in the school, and couldnt move from the bathroom because I just felt so awful, I began to dry heave and finally got sick at his house once through the whole day. After it was about noon that day, I was pretty normal.
Now, present day (couple months after), I have been to the doctor (for birth control) and weighed only 110, when not a couple months ago I was 125, the doctor told me for 5'6 Im underweight. Along with this information, I am nearly NEVER thirsty, and my boyfriend thinks Im addicted to sugar, because I went a couple days without it for a diet we were trying to share together, after only 3 days I had HUGE headaches and was well...a *****. My knees also have been feeling weird. That feeling when you have them bent for too long then you stretch out and pop them, I have that after feeling a lot for barely even having them bent for a certain amount of time, and when I pop them, they continue to have that weird after feeling for around an hour or two.
Sorry if this was long, but I had to list EVERYTHING that could possibly help, my boyfriend said that he thinks it could diabetes or hypoglycemia. Please help.