Leo update: It seems his pain is not getting any better. I will probably call the vet tomorrow to see how long they expect it to take for him to start feeling better.
If he should already be feeling better we will probably make an appointment to discuss the next step is going to be for him.
One success I have had is buying him a raised feeder thing. He is now drinking water on his own and not having to be forced to drink some! - 2 minutes ago