Thanks Edith M for the update! I took Ollie to a new vet who also prescribed metoclopramide along with the sucralfate.
A week ago I took him to an internal vet specialist and had an ultrasound and he was scoped. This specialist recommended I take Ollie off of the sucralfate and prescribed Budesonide. He had 2 episodes in the last 6 days so I put him back on sucralfate after consulting the vet. I will give an update when the biopsies come back from the scoping.
Glad your dog is getting relief.