Hi Doc, My husband has severe pain in the left side of his stomach. Occasionally he wakes up with diarrhea , vomiting and then the pain follows. He s seen a specialist who ruled out gastritis , stones, hernia , ulcers . He s been tested for H.Pylori.. nothing comes up in ultrasounds, x-rays or CT scans. Some doctors suggest it is caused by stress. Usually nothing sets it off; it just happens when he wakes up.He says it feels like his acids are out of control and vomiting relieves the pain for a moment. It s been happening for years and we still don t know what it is. What do you think?