Having a stomach is like having a baby.
Especially when that stomach has an ulcer.
It'll keep you awake at night. Though, as time passes, you'll get longer stretches of sleep.
You'll have to feed it at regular intervals. If you hold out too long for a feeding it'll get crabby and you'll have to spend some time settling it down.
You'll spend some time figuring out what it likes and doesn't like, learning what makes it upset and what calms it down. It can't talk and tell you what's the matter. So, you'll have to do some troubleshooting. Try one thing and then another. And never really know for sure why it turned out the way it did this time.
You'll read about it on the internet, ask your friends, and comb the library for information trying to be as informed as possible. Though you're still going to make mistakes. It's ok, though. We're all human. And what matters is that we learn from our mistakes.
You'll take it everywhere with you, cautiously introducing it to new situations.
You'll do the very best you can in hopes that it will all turn out alright in the end.
Yep, that's what it's like to have a stomach. Take good care of yours!