Donna, I hate to hear this. I know how you feel. I am going through the exact same thing with my Mo, who is 16 and has been my big boy since he came into my life at 2 months old. He did have the scope done and biopsy. He was diagnosed with IBD. The treatment is the same as for lymphoma. He has not responded to any of the meds they have tried. He went from a honking 20 lbs down to 9. He eats constantly but stays so thin, you can feel all his bones. He even wakes me up during the night to feed him and has stopped using the litterbox to poo (which is diarrhea) but does use it to pee.He started with the vomitting but we do have that stopped. If Bart does have IBD it isn't curable, but it is treatable. I hope your vet's treatment plan works for him.