Bactrim and agony

My husband had a cyst on his face. His primary doctor gave him Bactrim. The first week was fine, but then he got really sick and had to to go the ER. He was doubled over in agony, screaming, nausea. He was admitted. They scoped his stomach, CAT scan, X-rays. He got better ('cause he stopped it while in the hospital). They discharged him with a script for MORE Bactrim. He took it and ended up back in the hospital!

He has thrown it all out. He had chills, aches, he moved like a 90 year old man. He was very sick to his stomach with agonizing stomach and abdominal pain. He's still moving really slow and feels terrible. He says he can't taste anything sweet, either. We hope that resolves soon.