Those are the classic indications of a BLOCKED Urinary Tract!

Butter is starining to urinate - but nothing (or very little) is relieved ...
he's possibly suffering from a painful Urinary Tract Infection; or
the more serious condition of Blockage by a stone or crystals.

A BLOCKAGE won't wait - the build-up of urine can cause serious damage
and/or death!
If he hasn't successfully *pee'd* in the next couple of hours ...
He needs to be seen by a Vet or trained technician tonight.

I speak from experience - Boots da Kat "plugged up" three times before we
surgically "fixed" the problem.

*WATCH* him like a hawk for a couple hours - if "no pee" - then find a Vet!

/s/ Phred