Welcome to the gastroenterology community! I agree with what CalGal said. In addition to that, it is unlikely that you have small intestinal cancer. Has your doctor tried any other medications besides zofran and reglan? Do you live in the US? I too have gastroparesis so let me know if you have any questions.
No, it's not a bad thing the doc did 4 biopsies. In fact, it's a good thing. He probably took those samples from different regions to look for anything that might be happening under the surfaces of the tissues in each area - and that's great! Everyone who has an upper endoscopy should be so lucky. He did a thorough job and is probably trying to rule-in or rule out common conditions that can occur in each section of the GI tract that he was able to reach.