I can only comment on the ulcer part, and what it feels like with me.
It's a burning feeling in the high uper part of the stomach. if I eat something that trigers it, I feel nausea and then 10 mins later I throw up everything I've just eaten. Sometimes if I'm lucky the nausea feeling will stop and I fall asleep. Most times it doesn't play out like that, I usualy still throw up every 2 mins of acid (cuts my lips) thats when I know I have to go to the hospital, get iv,morphine(nothing else works) and gravol. I'm usualy stable after.
Do you have feelings like this?