Hi, I am an experienced veterinarian and happy to help!
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Passing pee is more of concern than poo.
Is he passing any pee at all?
So not even small bits with straining?
And it has been 24 hours since the last pee is that correct?
At least. not sure there are 2 others cats here. But I noticed today he was straining and nothing.
The biggest concern is that his bladder will be reasonably full after 24 hours of no peeing.
He has had one vomit is that correct?
Ok. The vomit indicates that he probably has some toxic products building up in his blood stream because of not urinating.
I think you need to get him to a vet now - sorry
If you leave him the toxic products can build up further and affect the brain and also the bladder can burst.
Can I help any further tonight?
So tonight not in the morning
Yes - NOW please