What is the most logical next event?

How to cure a cat of constipation
Monitor if your cat is urinating normally.
A healthy cat may urinate two to three times a day. Straining to urinate because of a bladder infection, bladder stones or a blockage are serious problems and very different than constipation.

Available options: *Go to your vet for a check up to see if your cat is always on their period. Your vet may recommend castration, specifically since a huge blockage is developing that won't heal within a week. *If your cat is using a toilet, then the problem is not likely to be a medical issue. If your cat urinates more frequently than normal, you may decide to replace her meal with diluted cat-friendly kitten milk. *Check your cat's litter box to see how much he is urinating every day. Check how much your cat is defecating. *Rather than to check for problems, just take a time out, go to another room, and check back in. Inspect your cat for constipation.
Check your cat's litter box to see how much he is urinating every day. Check how much your cat is defecating.