Suggest Treatment For Sinusitis And Headache

Hello. I have a problem with sinuses when I use computer. My doctor does not believe me, he thinks that it s some allergy but i know very well that I get sinus congestion after 1 , 2 or 3 hours work on computer. When I m not working on computer, everything is ok - no sinusitis and headaches. My RTG sinus scan says that everything is ok, sinus transparency good... but I think that s because I did RTG scan when I was ok. But if I was worked on a computer for few hours, I would get that problem with sinuses and headache. No bacteries in my nose. My doctor now maybe thinks that I m bluffing, but I really have that problem since my high school :S