Yeah, it's totally a psychological "I might screw something up" thing for me. Although since I'm trying to ward off serious inflammation from allergies, there's definitely significant constriction if not actual blockage involved.

I totally hear you on the swimming pool thing. It took me a couple weeks to get used to it enough to relax and let it work. It still freaks me out a little. But it does feel really refreshing after, so totally worth it.