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Hi. Welcome to Just Answer. My name is***** I'm sorry to hear about this situation with this guy. How old is he? Is he vocalizing a lot?
Ok. Thanks for that information. With him being an outdoor cat, there is the unknown as to what he could have gotten into or had happen. Could he be in a situation where he's injured himself form a fight or being hit by something? Could he have eaten something that is causing all this? I'm going to be honest and say that with any male cat that is acting like this, a urinary blockage has to be on the list of rule outs. If he's inside right now, if he's been posturing to urinate and nothing is coming out, then this is extremely suspect. Do you have any way to get him to a vet clinic? All you can really do at home is to keep him in a quiet area for rest and observation. There isn't anything specific you can do but nursing care.
A urinary blockage is fatal if not treated. What else may be going on if this isn't? Then the situation is a case by case. Could he have had an injury again like a bite or being hit by something? It is something where there are too many unknowns at this time.