Post-endoscopy pain

I had an endoscopy 2 days ago that was negative, but the doctor took two biopsies of my esophagus about two-thirds of the way down. Since the procedure, I've had a dull ache at the bottom of my sternum and, when I swallow food or liquids, pain as the food passes through the lower half of my esophagus and, most significantly, right before it empties into the stomach. The pain is similar to what I'd feel if I swallowed, say, a hard crust of bread without properly chewing it. Is this caused by the food or liquid irritating the biopsy sites or is it general soreness from the procedure? I'm somewhat concerned that maybe this is indicative of some kind of damage to the esophageal wall or to the valve or sphincter between my stomach and esophagus. I read that “trouble swallowing” for a day or two is a common side effect, but nothing about pain further down. I was told I could go back immediately to my normal diet, but am now afraid to eat anything but mushy food until this resolves. Anyone have a similar experience? I’d appreciate any insight.