 [ Symptoms ] after anal sex i experienced extreme nausea cold sweats and lethargy   no other symptoms was this related and why [ Disease ] an allergic reaction to neomycin is actually quite common i see this on occasion with neomycin containing eardrops your doctor needs to prescribe something else for you as well as treat the allergic response one more consideration since you have had this problem for a month is that the cause may not be bacterial you could easily have a fungal infection in your ear canal requiring an entirely different treatment