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Hello, this is Dr. Jess. I am sorry no one got to your question earlier. Did you take your kitty in to the ER? If not, and he is still acting this way, he needs to get in ASAP. Whenever I see a boy cat who is lethargic/painful/acting painful when you touch his belly I worry very much that he could have a urerthral obstruction or be "blocked", where he cannot urinate. This is a medical emergency and needs to be relieved ASAP, so if your kitty is still acting this way, and you don't know for certain if he has been urinating, he needs to be seen immediately.
Ok, hope he feels better!