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Hello. Thanks for the question.
Do you know if he has urinated in the last 12-24 hours?
Ok. That's what I was worried about.
I would guess that he's blocked. A urinary obstruction in cats is very common and most owners think they are constipated. They go from normal to straining/ pain to vomiting to lethargy and potentially death all within a fairly short period of time.
Treatment is by unblocking them with a urinary catheter, then putting them on IV fluids to flush out the kidneys.
Here is a nice handout on the condition:
I would get to a vet asap to treat this. It is a life threatening emergency.
This may be some constipation and a large fecal ball that is stuck. If that's the case, you may be able to use warm water squirted into the anus as an enema. I typically use warm soapy water or warm water and a water based lubrication. That can soften any hard stools and help him pass it.
I'm worried too. I would really try to go to a 24 hour vet. It may take a drive, but there should be something around. Call the local vets and see where they refer emergencies.
I just use hand soap and warm water or lube and warm water with a long tube type catheter. A turkey baster may be the best option at home. I think this should be the last option if there really isn't any ER around.