These type of doctors are very dangerous and probably do even more harm than regular medical doctors. They are basically experimenting on you with therapies that may be helpful or extremely harmful. Anyone who prescribes you Diflucan and Nystatin, run the other way. The first rule of medicine is DO NO HARM. Forget about identifying the specific species of yeast. Repair your body, bring everything back into balance and any fungal or other infections will also be cured. Look for a true healer that understands this principle, otherwise eat a clean diet and research your health on your own and stay away from extreme measures otherwise you risk ending up even worse.