chichilla seems like he cant breath

Question
he seems weak he doesnt move much and like he is weezing..and they he started twitching..i know he most likely will die very  soon but i wanna know at least what i did wrong so i know in the future

Answer
You need to get him to a vet right now so at least he can be put out of his misery or maybe they can do something for him. It can sometimes take small animals 3 or 4 days to die, its not fair to let it suffer, only a vet can tell you whats wrong with it. Please take him to a  vet asap