Am 66 Yo Male. I Live In Mountains Of Colorado

Am 66 yo male. I live in mountains of Colorado where their is low humidity. I use a CPAP machine with full mask because pressures are to high to use nasal cannula. Have used it for several years. moved to Colorado little over a year ago from Dallas, Tx. Have always suffered from a dry mouth at nite due to machine. Also use inhalers, Symbicote, and Vintolin. Within the last few days have developed a white coating on toung and sore feeling on same. Is this Thrush. I have a Dr appointment in 3 weeks. Is it safe to wait until then to see Dr.