have you been on antiobitocs or in hospital recently? If so go to doc and have them do a stool test for cdiff. Your symtoms are a lot like mine and that's what happened to me
You really could have gastroparesis. They can easily rule this out by a radioactive scan and the nuclear dept. of a hospital. You eat a "breakfast" - 2 fried eggs on bread. The eggs have a "dye" that shows up on the scan as to were the eggs are. If you have a slow guy, aka gastroparesis, they can detect it by this. It sounds just like what I was experiencing, and the GI can only help so much. I started seeing a natropath, cause I didn't want to believe the GI that the only thing out there would be pills for the rest of your life. The side effects of those is actually what turned me away from that trial.
I strongly encourage you to got to a gastro dr, get the scan and then you can decide which route to take.
Best of luck!