Well come to HCM Thank for asking I really appreciate your concern, dry mouth could be due to low grade fever, infection, hyperacidity and it could be due to medicines too, condition need to be differentiated and for that first to rule out the febrile condition and infection and for that get done the routine blood test, or it can be managed on tentative basis with antibiotic and best drug is Tab Amoxicillin with Clavulanic acid 625 mg, 7 days twice in day along with this Tab Omeprazole 40 mg with Domperidone 10 mg once in day, for four week, it is advisable to omit the ferrous sulphate, valvular heart disease it self causes the breathlessness, bronchodilator can be added with other medicine, I would like to say that you better discuss the line of treatment as long as the diuretic and digitalis are concern, hope this information helps.