Oh, another note...I had sinus infections and "sinus" headaches for 9 months straight before we found the cyst...it was removed, they promptly returned if they ever even went away...
Finally got rid of the infections, but I still have them several times a year although they are not constant like they were...
I eventaually came to the conclusion that the headaches were migraines and a disease instead of "sinus" headaches and now they are treated with preventative medications daily, and abortives/rescue medications as needed and I live a much more productive live.
See a doctor and find out what the bottom line is. A CORRECT diagnosis is first step and knowledge is your best line of defense!