I have headaches most days, either sinus or migraines. The sinus headaches can be as debilitating as a migraine. I finally found a doctor many years ago that dx the problem.

My sinus would be fine and no cause would show for the head pain...as an Allergist specialist was testing, I started having a really bad headache. He gave me something for the pain and asked me to come back in a few days.

I had a moderate headache but he wanted to try something...he gave me the same test again...severe headache. He again gave me something for the pain. My everyday headaches are caused by allergic reactions.

Have you had this checked? My sinus would be clear, no infections, no stuffiness, nothing except the headache.

Hope you find answers soon...and I think Twink is right, you might need to see an neuro just to rule out a few things.