Hello! I have a lot of neck tension and I get occasional sharp head pains that last for a short period of time, I also get different head pains when i move (Stand up, cough or laugh to hard), those pains are occasional as well. Every time I turn my head, i hear a lot of crunching and grinding going on with slight pressure and there is a clicking in my head when I jump. I'm concerned this could be some type of cancer or something. I also feel a sort of a shaking feeling in my head when i lean my head against a chair or something, could that be from the neck tension?