My husband has a UTI and was prescribed Bactrim and Pyridium two days ago. The first day he threw up after taking the Pyridium. Since, he has been lethargic, weak, unsteady, and doesn't have an appetite. He took the Bactrim tonight and 2 hours later got nauseated and threw up clear liquid. He isn't having anymore pain, but is still urination every 15-30 minutes. Is this normal for a 67 year old male?