Infectiin in mouth after rhinoplasty? Please help in pain

Its 5 days after rhinoplasty andday 3 i started to feel a burning sensation in my throat as if i had blisters. My uvula was red irritated and stretched out like a long piece of gum flapping around. My sublingual fold was red and swollen. I have post nasal drip My tongue dried up in my mouth as i was sleeping and i awoke and couldnt breath for 7 seconds trying hard to salvate. Later again my tongue dried up again. Do i have infection? Im still on cephalexin. Why would i have an infection