That is a thing. I met a mother-daughter duo, they'd travel with a little bag and disappear to do that and it wasn't a big deal and they claimed results.

Really no idea, there are quite of few of these potential treatments, people actively try and hack it. It depends on the specific situation what is appropriate to try.

I'm in full remission for a very long time already against all odds. It completely ruined my childhood and I'm thankful for everyday and live with it as a sword of Damocles like so many others.