You said your cat is walking like he's drunk & tipping over? I experienced this dame sudden onset with 2 different cats within a few years time. In both instances it was a stroke. No cause was ever determined as borh cats were relatively young (5 & 7) and very healthy & active & indoor only. It came on suddenly, one while sleeping the other while sitting on a chair gazing out the window. Sadly, for us, the only option was euthanasia because cats do not recover. I wish you well with your cat & pray for a curable cause for his problem.
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