I wasn’t able to reach my friend again who had surgery to correct her gastroparesis to get the details, but I found multiple articles online (I’m no expert) about surgical treatment options. And, additionally options for electrical stimulation devices to treat it. I saw one device made by Medtronic, who makes my insulin pump. Think it’s called Enterra therapy. I have no affiliation with the company. I might check a medical facility that has the most current information on treatments.