Feeling nauseous, threw up and now feel like i have some food still stuck in throat. it also burns when i drink water or swallow. ?

Acid: When we vomit, stomach contents come up into regions that aren't prepared for them. This means that delicate tissues are exposed to acid & enzymes from which they have little to no protection. So, they get burned and irritated. It's normal for things to be sore for a few hours after. Try soothing medications like preparations of bismuth and return to eating slowly with bland foods at first.