Your biggest curse is that, you want to play competitive at high level, but finds out that people doing it are not tolerant for you disability.
This is how it is, to be the top performing you have to be rude and intolerant and very selective as well, because top tier content is demanding and there is no place for a lot of mistakes. My advice for you its to not share your story with them thats it. I would be ostracised as well if i would tell them that i have an ibs and need to take often breaks from the game.