You sound like exactly what I am going through. But I know I had parasites beforehand when I took anti-parasitic herbs and experienced scattering. Thats when I saw a worm under my skin and knew it migrated to my head. But I had no luck with doctors who dismissed me and wouldn't provide treatment. Recently I got a zapper and started using it a lot and thats when I really started feeling then and in my head area. Next I felt them in my ears and one of my ears started bleeding and I have experienced head pains like you describe. I know thats not what you want to hear but it sounds like a possibility.