I have pain (only) in my left sinus area that has gone on for some time.  Thought it was a tooth issue but not so.  Suspected tooth has been pulled (May 2013) and the pain is still there.  X rays are not showing anything unusual.  Its a continual irritating pain. It also causes the left eye to water and when I blow my nose it bleeds.  I do have hay fever and other allergies.  I have also had major surgery (2010). Tubes were run through the nose to the stomach durning recovery.  I wonder if this may have something to do with what is going on.
Yes if you are having allergy it may be sinuses also infected with allergy as in allergic sinuses more of mucus IDs formed due to irritation by allergens the pressure of mucus causes the symptoms you described you need to find the cause of allergy and treat accordingly by consulting specialist doctor