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Yes, I believe this is worth the ER trip. Why?
He is continuing to exhibit symptoms of stomach distress, and it has now persisted for 2 days. We just don't know if this is due to bad stomach distress (gastritis), some dietary indiscretion that has made him ill, or even something foreign ingested.
You can give him a tablet of Pepcid A.C. antacid, regular or maximum strength. I would not give pepto since it could constipate him.
Pepcid A.C. is very commonly recommend in dogs and cats for upset stomach, but he needs better care. A 4 year old Standard Poople should not be exhibiting stomach distress over this duration, so I vote for the vet visit today!
Possible testing might include some abdominal x-rays, even if he is not vomiting, and/or a basic blood test just for an overall health check. Wish I could do more. You tried a good bland diet, but if not even willing to eat that food, you know its worth the vet trip.