I am taking allergy shots, flonase, aquatab D, and now celexa.
I don't really feel depressed. My Allergist thanks that I suffer from mild depression. He said most people won't know they suffer from it.
I think him and my ENT are not convinced it is sinus because sinus headaches have facial pain and the headaches are on your forehead. I don't have facial pain and my headaches are mainly on the sides and on my temples. This area usually means tension headaches.
I also don't really have any congestion, just post nasal drip.

I have the fatugue and post nasal drip year around. It is not seasonal.
I had a cat scan done it does show some blockage but my ENT does not see anything that looks severe enough.

I don't think it is migrains unless they can be mild and from I understand they usually are severe headaches. I don't ever really take anything for them because the pain is not that bad. Just constant. I have a hard time concentrating and focusing.

Thank you for all the replies.