Actually if you did have a Candida infection that is a fungal infection, not bacterial, so you were treated with antifungals, not antibacterials. Probably the most common one which is Diflucan, though there are others. Not being critical, just correcting things incase a future reader follows this thread.

As to the original question if you can scrape off that white/tan coating with a fingernail and it is kind of red sore underneath, that is likely Candida albicans. Please point it out to your doctors. The treatment takes about a week of pills, and sometimes a mouth rinse. Please have someone take a look at this, when it gets out of hand for too long it is really hard to turn around.

The dry mouth is likely going to be with you for a long time. I use the Biotene products, toothpaste, mouth wash, gum etc. available from everyone from WalMart to Walgrens. Some like others. But you need to also address this since it can lead to periodontal issues, and you don't want to come through all this just to have rampant gum disease at the end of things. 12 years after the fact, a water bottle is as natural a part of my hand as a watch or a wedding band.