You didn't say what the problem was. If it's a GI obstruction, there are numerous things that can be tried that can be successful. It depends on the condition of Norman. If kidney function is severely compromised already, you may not have time to try anything else. if the obstruction has not caused any major problems yet, then you should try some alternatives to see if they work. If it is an obstruction, I would suggest getting him on antibiotics (something easy on kidney & liver function) now even if the blood tests do not show signs of an infection yet.
Norman has a urinary tract obstruction. The vet has tried twice to dislodge it without surgery and is going to try one more time in the morning before doing surgery to remove the obstruction and widen the urethra. Poor kitty.