Momma ~

I'm a KatDad who went through this -
And upon the previous advice of my Vet -

IF the Cat is either "straining" or seemingly "in pain" -
*RUSH* to either your regular Vet or an Emergency Vet!

A urinary blockage ia an URGENT, Red Flag Emergency that
must be cleard within a few hours of the onset.

My Boots had THREE re-lapses after getting un-plugged with a catheter;
he then had "The Operation" to re-route his "plumbing".

Your Vet should have given you some "instructions"
on what to expect and do...

Did he/she tell you to "force" water into the cat?
A cat recovering from a urinary blockage *MUST* drink a
considerable amount of water to "flush* their system and
prevent future blockages...
My Boots was "encouraged" to drink with a Syringe -
open mouth, insert syringe (withOUT the needle on it),
and *SQUIRT* a teaspoon of water down the hatch!

Please - DO NOT *wait* - CALL the Vet right away!

/s/ Phred