Any chance that you could have a sinus infection, especially one caused by a strep infection? Have you had fever, recent sinus congestion, or what you thought was a cold? I remember having the sensation that my brain felt like it was moving opposite of my head when I had to sit up or move my head. My eyes were sensitive to light and hurt to move them. The pain was like no headache I had ever had before or since.

I hope you feel better soon.