KayAnn, so sorry to hear about your father's ills. I have ulcers too although not as severe as your father's. My brother, who is a doctor, said that Pepto-Bismol actually will neutralize the bacteria that cause the ulcer and may provide temporary relief when the pain is really bad. Needless to say, I take a bottle with me everywhere I go. I'm sure the doctors your father is seeing will give him loads of info on treatment and diet.
I hope he gets well soon.. Tell him we're all thnking of him, maybe show him some of the funnier posts here to cheer him up! We can be a funny crew at times....Or better yet, have Simba spend some time with him....