Treating Thrush, Chronic Oral Yeast Infection

I ve been told 2 years ago that I have Thrush. I was under different anti fungal medications (Duflican, Nystatin, Clotrimazole, herbal remedies). The symptom (bad breath, white hairy tongue) go away as soon as starting the medication but it comes back worse only after 3 days of using medication. I also suffer from constipation and swollen stomach (it looks like I am pregnant when I m not even fat) and I am wondering maybe that is the reason of bad breath and abnormal tongue, or perhaps the yeast has caused the constipation. My diet doesn't have too much sugar or yeast at all but I still eat fruits, bread, sweeteners, and so on in moderation. I am really tired of meeting my doctor since all he does is prescribing more anti fungal medicine that probably have side effects and they don't do much for me. Please tell me what to do.