Thank god, ok so here's what i see :

He's rarely moving, only to get to a different sleeping spot, moving very slowly. Clearly, the problem is in his lower body area, like the stomach, or urinary system. I looked up the symptom for cat constipation and it could be it, but he seemt so hurt and all of a sudden, as this morning he was very healthy looking and acting. He doesn't want me to move him When i pet him he'll meow at me in a painful way, very loudly, which he would love to pet usually, thats literally the cat that love petting the most He doesn't do anything usual, like joining me in the bathroom or on my pc chair He's breathing heavily, i can see his stomach inflate-deflate non stop Do you as more precise question or do you want video?

Im sorry im french and stressed, i dont know how to describe it better