How To Treat Pus In The Back Of Throat Inspite Of Using Nystatin?

H have had a congestion for about 6 month. Have gotten different anti-biotics with no help. I have had a balloon procedure about 7 weeks ago 2 later days later I developed pus on the back of my throat and uvula. The uvula was so swollen that it touched the back of my tongue. It felt as if I had food sitting there. I was on antibiotics and fungus medicine after. The swelling of the uvula is gone, but the pus in the back of my throat still there, less than originally and I coughn consistentl and bring up green stuf.f. I still use the NYSTATIN, but it s almost gone