After taking Xifaxan 550 mg tablets, 1 tablet twice a day, for 21 days, gastro doctor treated me for oral yeast infection wth Clotrimazole 10mg, and then Nystatin, 100,000 units/susp. (about 2 months ago). Just recently finished a second round of both medicines (about 2 weeks ago). Now on Carafate, combined with benadryl to treat swollen taste buds and mouth ulcers. Is the cause of all the mouth problems due to Xifaxan?