My doctor could not diagnose anything wrong and could only prescribe stronger painkillers. I went to 3 doctors in 5 days for help with no answer. They couldn't see anything or feel anything on the surface.
I got 'it's not shingles" and "it could be an inflamed cebaceous cyst" and "it's a form of neuralgia
problem - i went to a physiotherapist who pinpointed the problem straight away. He felt my neck and straightaway located all the sore points on my head. It was amazing.
He did some head twists and muscle pops and wow! After 1/2 hour, i could turn my head again and for the first time in 10 days I didn't need painkillers to sleep.
So don't just look for a medical answer. Look at your body as a whole - it is all connected.