What is the diagnosis? A lot of people have success with golden paste made from Turmeric, fresh ground black pepper and coconut oil. There is a group on Facebook you can learn from.
The Rx you mention is for reflux, but what you are describing sounds more like diabetic gastroparesis. That is hard to treat other than controlling blood sugar and eating small meals, chewed thoroughly. Tumeric plus Nigella sativa can control blood sugar.