I'm currently having an almost constant stabbing pain behind my right eye, with the same eye is a bit red. It's also watering and twitching, and I have a stuffed-up maxillary sinus on the same side. I can't decide whether it's a cluster headache, a migraine or a sinus headache, as the symptoms could fit any of them. I just wondered if anyone else suffers from this and if it's worth going to the GP? From what I've read, there's not much they can do and I don't want to waste anyone's time.