What do you recommend if i had my gallbladder removed 3/4 years ago, pain when eating fatty foods getting same pain when on erythromycin?

Not the gallbladder : So its obviously not caused by the gallbladder, but could be a functional problem such as irritable bowel. Primary common bile doct stone and pancreatitis are uncommon possibilities, as are GERD and/or gastroparesis. Best to see your primary care provider for a more complete evaluation depending on the severity and/or progressive nature of the symptoms. Hope this helps!