Yip that's exactly it! Sounds crazy, it first started in my twenty's and went away but after a bout of health anxiety a couple of years ago it remains (or should I say I keep fueling it). I do have anxiety and when the sensation is at it's worse my nose can actually throb! I feel very much alone as I've never come across anyone that has the same problem. On a good day I can bat it away but it seems to have a grip of me at the moment.