So confused

use hair dryer to dry off after bm, wear cotton undies, if possible sleep on belly buns up in the fresh air. anything to keep dry. even powder your bottom.

I had the same problem. Your doc is right - where you can, avoid barrier creams as these make it worse. The trick to solve this in my case was to use salt water when cleaning the area down there and to take a probiotic daily such as acidophilous (sorry probably not spelt correctly). Don't wear undies at night - let the air get to it and like the earlier post suggests dry down there with a hair dryer everytime you wash. If can avoid washing too frequently all the better. I also used Canesten internal cream in the area - the pharmacist said it would be fine when things were really bad.

Once the yeast infection clears up you will find burning / itching reduces and you wont need a barrier cream unless you eat something really naughty.

The trouble with yeast infections is that they are very difficult to distinguish from the usual "butt burn" and it took me weeks of figuring out what it was - you're lucky your doctor has got to the bottom of the problem (no pun intended).