Painful Mouth

About a week ago I started getting a sore throat. I woke up one morning and had white patches (actually perfectly round little circles) on my uvula and the sides of my throat where my tonsils used to be. I began running a low grade fever and over the next couple of days my throat got worse. The white patches spread to my soft palate and to the back of my throat. I have a supressed immune system because of Leukemia so I did'nt know if I actually had Strep or a yeast infection. Just in case I started using nystatin swish and swallow. It hasnt seemed to make a differance. My mouth has gotten more and more sore. The white patches turned to angry red ones and spread accross the roof of my mouth. My throat felt swollen and sore down in it and I had trouble sleeping. Now my tongue is involved and is so sore, burning constantly even when I am not eating. Tonight I looked in the mirror at it and my mouth, my tongue is swollen and an angry red, the roof of my mouth now has like white streaks running across it (looks like scar tissue from a burn). My throat is still uncomfortable though not truly sore anymore. The lymph nodes down both sides of my neck have been swollen and very tender all week. Yesterday I woke up and under my chin on the right side there was a bulge like it was swollen, there is a hard knott there the size of a grape but it is not tender. But when I press on it, it does hurt up under my tongue. My tongue hurts so bad I cant hardly stand it. Can yeast cause all of this?