I would definitely take him to a vet as soon as possible. Also make sure he's using the litterbox and able to pee. Or if there's blood or reddish pee in the litter. Our cat, at about the same age, ended up with bladder stones and a blockage that caused him to yowl and scream, and he acted very on edge. Blockages are very serious and are much more common in neutered male cats.

Because he wasn't a helmsman, he worked the Conn position.

So glad you were able to catch it when you did! We have some prescription food (Hills Science C/D multistress) for our orange boy now and switched to mainly wet food. Fluids are really important especially after one blockage because they'll be more prone to them of they have it once. But we haven't had any problems since! In case they didn't, have the vet show you how to check your cats bladder. You can check and see how full it is and that can give you a good indication of how the recovery is going or if there seem to be any problems later on.

It took a few weeks for our boy to return to normal completely. He was on gabapentin and other meds for a bit. And he ended up having to go back to the emergency vet a couple times due to getting blocked again within the couple weeks as the first one. Hopefully getting it caught early on means yours will have a smoother recovery! The best thing to do long term along with the special diet is minimizing stress. I wish you and your cat the best!