I was told i have ibs-d but recently i have had severe burning in my stomach after eating. can't finish a meal/nausea/indigestion. what could this be?

Call GI doc: Sounds like these are new symptoms. The GI doc needs to know about them as they could indicate an alternate diagnosis, or at least a separate diagnosis. Could be inflammation of the stomach for usual reasons (medication side effect, H.pylori infection) or indication of more extensive inflammation (Crohns disease for example) and a new evaluation is warranted.