Suggest Remedy For Chronic Abdominal Pain Post Treatment For Viral Infection

My husband was treated last Tuesday for viral infection. He vomited and had pain in his stomach. He had nausea. They gave him meds to coat his stomach and meds for nausea. He felt better Wednesday. On Thursday, the pain came back. Felt better Friday evening. Pain came back Saturday night. Some relief Sunday. Still in pain but on upper right side. No more vomiting or nausea. Stays cold. Sleeping a lot.