Mysterious condition, can anyone help? My nose randomly swells up and gets red

First of all, I'm not really sure that a septoplasty is what I need, but RealSelf doesn't have a "general" or "other" category. I have been dealing with a mystery for about a year and a half now. I've seen 12 different doctors and none of them can figure out why my nose randomly swells up and gets red for anywhere between 5 mins and 2 hours everyday. At one point they thought I had carcinoid syndrome but a urine test ruled it out. I'm at my wit's end.