@dmferrara I don’t think you can ever over react, many times I have taken my dogs with minor problems for peace of mind. Granted the vet fees mount up but it can work both ways if you hold off and it gets more serious the fees are higher.
Usually when one has stomach problems they give them fluids to avoid dehydration and settle their stomach.
My latest B is very healthy but he does get allergies sometimes. I took him to the vets at midnight one time and they gave him a steroid shot. Poor guy couldn’t sleep before we took him with his face swollen. After the shot within 30 mins he was almost completely normal.
Hope all goes well and they figure it out.