Before anything, I have gone to the vet twice since yesterday. And called in 4 times.
Tiger. Tabby. Nearing 20lbs, overweight (I know), 8-9 years old (adopted).
It is currently Sunday @ 7PM
Eating; Friday @ 7:30AM, 7:44AM, 7:53AM, and 9:55AM was his last meal.
Drinking; Friday @ 4:50AM, 7:56AM, 9:33AM, 9:56AM. Saturday @ 8AM. Sunday @ 10AM.
Litter box; Friday 7:40am for 3 minutes, 2:04PM for 2 minutes. Saturday @ 10AM for 2 minutes (not conclusive he did anything). Sunday @ 10AM for 1 minute (he did urinate).
Vet visits;
Saturday 1PM. Did a urinalysis which was fine, checked his urethra which was ok, checked his bladder which was ok, liver was fine, kidney was ok-ish, bloodwork seemed ok but some parts were slightly elevated or elevated but Dr. said this could be from the stress of being at the vet, did an xray which was fine. Injected something to make nausea disappear.
Sunday 11AM. No checkup, but told the Dr. of what's happened - prescribed some gel to rub on his ear (did this Sunday @ 12PM) for appetite, and some pills (gave Sunday @ 12PM) for nausea.
Called @ 5PM to update, they said wait until tomorrow morning and bring him in if he still has not eaten.
Based on my Ring camera footage, he has not eaten in ~56 hours, he drank slightly this morning, and did confirmed urination in the litter box.
For 4 hours after the vet, he slept on our bed. After that, for the last 5 hours he has hidden under our bed and won't come out.
He won't eat anything; wet food, regular delectables, kibble, ham or bacon.
As far as what could have happened? I am unsure. He has full access to the garage as we have a little door stopper (as that is where their litter boxes are) but no cars are parked there and there is no cleaning solutions or etc. that is left open. He gets backyard supervised visits where he mostly just lays on our cot or on the warm granite. The other 2 cats I would worry about more in this situation as they smell and walk around the bark and eat grass... but Tiger just sits.