Ulcer- advice please!

[Abpickerel]

We are having major issues with our Crossbred Barrow. We've determined, with a vet's help over the phone, that our Barrow has an ulcer.
We've been giving pepto, omeprozole paste, B12 paste and electrolytes. He still isn't wanting to eat on his own (going on 7 days now) but we are basically forcing him to eat (wet feed with pro gut and cake mix for the sweetness, We've also given bananas and yogurt)
He occasionally gets up to drink or change spots but that's it.
Even with eating a little each day, he hasn't had a bowel movement in about 3 or 4 days. Most likely because of the meds. So we're trying to figure out a safe way to fix the constipation. We're going to email Purdue (we're a couple of hours away from there)
But I wanted to ask here if anyone has dealt with this before!

[shepuurd]

So what did Purdue say? Ulcers are a big problem