One of my cats started sneezing last night, didn't think anything of it at the time. He usually sneezes once or twice a day, no biggie. But it was different last night. His breathing is labored and sounds congested. He is lethargic and doesn't want to eat(even offered him tuna-big treat). He just seems to want to sleep. I don't like the sound of his breathing. My vet won't be open until monday, and I may not get an appt. for monday if they are booked up. Anyone have any experience with this? Should I get him to the 24hr vet clinic? I prefer taking him to the regular vet, will he be okay until I can get into the regular vet?