I have gone that route. About 6 years ago it started and went to a Dr. Park , a gastroenterologist, who told me I needed a colonoscopy. I had one and he just ignored me after that. I do have pictures of the inside of my stomach, it looks terrible. He gave me something for nausea for a very short while then nothing.
I have been suffering ever since. I take Zantac, which helps a little and anti-motion sickness pills and Tylenol for the pain. It helps for a few hours, time that I sleep. Some days I sleep all day, some days most of the day and I still sleep a night. The zantac and anti motion pills make me very drowsy.
I am having a bad spell right now, been going on for about a week. I hope it lets up soon. I have to go and get some food.