After taking several doses of Bactrim for Montezuma's Revenge, I ...

After taking several doses of Bactrim for Montezuma's Revenge, I have devoloped skin irritations; and on one occasion, my hands, face, arms and parts of my legs broke out with hives (atleast I think they were hives). The second time I ingested only one tablet of Bactrim for the same purpose, the back of my left ear grew warm, and the next day some skin wiped off of it, and I have noticed that parts of my face feels like tiny threads of string are draping across it, even though there aren't any.