Have you had this before and how long did it take to heal?

It's been a week, symptoms started getting worse on Thursday, went to the doc on Friday, prescribed medicine. Its very painful for me to eat and drink water. And I really can't put up with the pain because it is that severe... I'm getting anxious about this because I haven't been eating or drinking water much this week. How long does esophagitis last? Should I go to the hospital if it doesnt get better in a few days? The pain is worse on the right side of my upper back, after I swallow I get an intense burning sensation there which puts me off eating and drinking water.

Thank you.