All drugs can have side effects but the side effects only apply to a very small minority and even then are often very mild. Reglan can be very effective in dealing with gastrparesis as it stimualtes the gut to help food move through the system more quickly. Like most people I tool Reglan with no side effects at all. It sounds to me that your symptoms are worse than any side effect might be. Your doctor is likely to be a highly trained gastroenterologist so why not use his advice rather than asking non medical people here.
You can also get digestive enzymes which will help with digestion and they can be bought from a health food shop.
Good luck.
yes, i have gastroparesis along with gastritis and ibs-c. the entire digesting system is inflamed, i'm in pain with no real releaf in sight. the meds i was given had too many side effects (reglan) and a muscle relaxer for the ibs, but that would make it worse. hopefully someone out there had a similar problem with a much better answer than i