I'm so good that the Dr said exactly what I had stated. My daughter was diagnosed with gastroparesis, in 2007 with many of testings and endoscopes. So I do have much experiences in dealing with gastroparesis, keeping her A1c around 6.5, for the past several years, by using the an insulin pump, pumping with Novolog, and now Apdira. With that in mind, what your dr has said..IF he does find that he is being diagnosed with gastroparesis, I'll be more then happy to help you out, until then..I hesitate to add more reading about gastroparsis, and list the other tests that can/should be ran. It pretty much sounds like, he might be rebounding, not enough insulin, insulin resistance, or even having an allergic type reaction to insulin. Maybe a combination of all. I would not discount what the other wise people here have to say....it all sounds pretty complicated. Please keep us posted..and PM me if you need help on gastroparesis type issues. ETA: Have they checked his bowels? A person can be constipated and still have a bowel movement every day. If the large bowels are blocked then there is a change the small bowels are also, this would leave food in the stomach. If food can't leave the stomach, then there is no other place for the food to go but up (vomiting). Hopefully, they can Check the bowels, its simple..its an xray.