headaches

I have been experiencing headaches almost everday for a couple of weeks now.  I think I could deal with the headaches if that was it but they are usually followed by a disorentation and a foggy brain. Basically I can't think straight or concentrate. The worse part is the fact that I am behind in my online economics class and they seem to hit as soon as I try to get caught up. The semester is in high gear and I am trying to finish the Master's in history, getting my paper finalized, and working on the M.B.A. and just can't do so well when I can't even make it through a few hours of study without this happening.  I go in for my physical on Thursday and hopefully can figure something out then.