Wierd feeling inside my head/brain

I've been having this really wierd feeling inside my head like if it was being squeezed softly, it's like a hard to describe feeling like as if literally a part of my brain was being grabbed.. I'm having trouble sleeping because of it, and I feel really lightheaded sometimes. It's not always the same place but it doesn't change alot, and right now for example it's as if someone was touching my left side. I'm 15 and I've never had this feeling before.