If his bladder infection was bad enough, he could've gotten septic. You may already know this, but that's when the infection goes into your blood. It's a serious infection and can cause odd behavior, but I'm not sure about seizures. I could be way off here, but hopefully the medicine will kick in after a couple days and he'll be good as new. He's probably not eating much because he doesn't feel good. Don't worry, just try to find something he will eat and keep him hydrated. Whatever it is, it's probably not unusual for it to take a few days to feel better. Hang in there!!
