I had surgery 6 days ago for a peri rectal fistula. I was given Tramadol for pain, and Metronidazole. I am healing fine from my surgery, and feeling better until Friday. What started off as dry eyes is now bright neon red bloodshot eyes, weeping, grittiness and they are swollen and hot to the touch. I stopped the meds yesterday, but now have this severe (appears to be) allergic reaction to god only know what. I am little headed, dizzy, sore throat and irritated sinuses today as well. I have no known air borne allergy so I am mystified to what this might be. Please advise- but I am calling my doctor tomorrow.