The doctors did cat scan, mri, blood test, heart test. but they cannot find the cause of my head pain(pain movin), sometimes i feel like a mucus in it?

Sinus Headaches?: MRI and CT are pretty good tests to find damage inside your brain. Many times these tests can also detect sinus problem from those images. For your "moving headache" other causes such as migraine, systemic illness or psycho-somatic issues, needs to be considered, if imaging studies have been negative. Your regular doctor should check you for a better assessment.

A heady subject...: Have they tried some medications?Usually,if something can't be found on those tests, then they may try a few medications and gauge the response.Usually tried for something called 'migraine' or 'migraine variant' or 'common migraine' or plain old'cephalgia.'In other words, a headache of uncertain cause.Ask about this. But avoid narcotics like Vicodin and Percocet if you can. They can make it worse.