I've had sinus problems for years. I can tell you want my doctor has done. He normally does an x-ray if it doesn't respond to antibiotics. It's real easy to see on an x-ray where the inflammation is. I've also had a CT scan, which is much more detailed and can show polyps and such. There is surgery you can have on your sinuses which is supposed to be quite helpful, but I haven't gotten to that point yet. If antibiotic alone don't work he usually puts me on a round of steroids (Medrol) and a nasal spray (Rhinocort) and that usually clears things up. Good luck! Hope you're feeling better soon.