For the last 4 months on and off I have had bad headaches, if you could call them headaches. Usually I get a very sharp pain somewhere in my head for a few seconds then it goes off and a few seconds later returns some place else. These often arent just confined to my head and I can get them in my chest, stomach, wherever really. They are often accompanied by a tingling feeling, dizziness and my head feeling very heavy. I've been to the doctors about this many times and they say they don't know what it is, but do blood tests and find there is nothing wrong. My doctor says I have nothing to worry about and it could just be post viral. What do you think?

Thanks in advance.