Yes, they do not care if he doesn't have the money, they simply will turn him away.
To me he could have feline cardiomyopathy. It's the lethargy that keys me. He could still need more medication for his UTI also.
Also, the movement problem goes with all this.I would get to the ER. Explain you are a student.
I don't believe it has anything to do with his heart, he's had ongoing issues with his urinary tract for a bit, and it got out of control.
BTW @missingone123 what's up with that bump on his lower tummy today?