Gastric stimulator?

my psycho babble BS or therapistsuggestedI try to ask for help so here I go. I am 49, I have type 2 diabetes, severe diabetic neuropathy in both legs and arms, ischemea, coronary artery disease, stage 4 chronic kidney disease, 2 spinal cord stimulators because I have IDD( internal disruptive disc disease) and the one I really hate GASTROPARESIS. I am in limbo. doctor wants to put in a j tube because I went from 190 lbs. to 162 lbs in 1 month and I only eat once a day if I am lucky.. went to go get mri to check intestinal track, but due to gastroparesis I couldn't drink the radioactive solution. due to gastroparesis. so I am looking into the gastric stimulator. what is the criteria? what hoops do I have to jump through? I need help please. thank you and God bless you.