Hi. My name is Kaitlyn. I'm 17. About a year during marching band practice I got really lightheaded, I felt like I was going to pass out, everything got really bright in my eyes, I was dizzy, I felt like I was going to fall, I was sweating(like cold sweats), I was pale(my friend said I look like a ghost), I had a temp of a 103.5, and I felt cold. When I sat down I felt fine but when I got up it all came back and sometimes it still happens. I don't my doctor but he said that he doesn't want to do any serious test and that he just thinks its because I don't have enough protein. Can you please help?

With a 103.5 degree temperature I would be inclined to think that you had an infection of some kind.

Another thing that can happen is getting overheated. Was the outside temperature hot when this occurred?

You had a fever of 103.5 and your doctor didn't want to run tests?

... where did this guy get his degree? Get another physician.

I have to agree with Sneezy here. Get another doctor.
With a fever like this you need some tests run.

It sound like you have a body deficient on necessary nutrients for proper functioning which makes it weak and your metabolism slow. It can lead to problems with blood, infections, make you get tired and overheated easily. The reasons might be many, but it is certainly not a right body condition for 17 year old girl. You should make sure you have enough rest (sleeping ENOUGH and in the RIGHT HOURS is very important for a health of a girl of you age: going to sleep early and waking up early), balanced easily digestible food (work toward creating a good variety of good quality wholesome and natural, preferably organic foods), take quiet time to eat, do not eat on the go, drink enough during the day (herbal teas are very good), most certainly avoid sodas, fast foods, alcohol and smoking (even if not you, but someone else is smoking next to you), avoid being under direct sun 11am-3pm without clothing and hat. These might seem to be simple things, but more important for your body that you might think. Good to start with. Your body is young and should be strong, so often times just correcting these can give a chance for your body to recover. I have seen it many times and hopefully it is the case with you. On the other hand you should remember than even the strongest and healthiest body WILL go down the hill sooner or later if is not given what it needs for proper functioning. Take good care of yourself, being a girl it is very important. If problem persists, I suggest to find a good holistic doctor with detailed personal approach.