My thrush seems to be becoming worse day by day. Initially, it was a small ulcerish patch on the left border of the tongue, now it has reached the back of my last teeth (third molars, I guess). With that it becomes to difficult to even open the mouth a little bit. I was recommended Flucanazole by radiation doc, but I seem to have discontinued sometime last week because of constipation. I will start it back again.

Any suggestions on getting it under control?