Is my doing going to pass today?

Yesterday he was fine. Totally normal. Today he woke up lethargic and has eater, drank water or moved. He’s just in and out of sleep.

Age: 11 Medical: epilepsy (grand mal seizures) and he’s phenobarbital. This diagnoses was 3 years ago.

He tried to eat his breakfast but he just spit it back out. I went to run errands and when I came back he had not moved from the same spot or had any water. (I checked my cams, he never got up)

I tried to give him a treat but he spit it out. He also didn’t want to stand up to go out side to pee and poo. I eventually got him to stand and walk and he peed and pooed but the poop was soft. He went Back inside struggling and just laid down but he hasn’t moved from the spot since. He did not eat his dinner. I got him to drink a little bit of water with a syringe. And I got him to take his meds.

My vet office does open till Monday morning. Are these signs of a dog about to pass?
If he does what do I do? It’s night time. I live in Los Angeles, I have never had a pet pass in a city before. What am I suppose to do?