Well the spit test should not be used for diagnosis:
If you want to find the cause…have you ever taken antibiotics or acne medication or birth control?
You could consult a naturopath and develop a good plan to get better. You could also take different supplements such as better probiotics, better antifungals, and stuff the repairs your gut and liver. There’s a whole alternative health industry created to treat people with health problems with brands such as genestra/seroyal, thorne, standard process, pure encapsulations, integrative therapeutics, etc.