You may be starting to develop migraines. Sometimes, instead of a full-blown headache, I will just get a really sore spot the surface of my head. If that's the case, there is not much you can do but wait til it goes away.
Your head and scalp is covered in nerve endings so pain there is really nasty!! :O(
Some spider bites will do that. Check on your area and the spiders there. If not. You just a baby, right? Stress can cause hairloss. Been going without much sleep?
Is it possible you have a bite (i.e. spider, mosquito, etc.)? I got bit on the head once, and I had the sore, itchy head too, but I think I had a bump.