I have a history of sinus infection and have had anteral windows done twice. I recently began having very severe headaches around my forehead and behind my eyes. However, a CT shows no active infection in my sinuses. My symptoms are similar to migraine symptoms (severe headache, blurred vision, dizziness, nausea), except that my forehead is visibly swollen and VERY tender to the touch when the headache is bad. Can a person have swelling of the forehead due to a migraine or due to a sinus condition other than active infection? Or do you have any other feedback on what might be causing these headaches? Thank you for your time.