Absolutely the worst is the worrying--Patrick has one every year, there has never been a problem, and I'm still a nervous wreck that day. Chances are very, very good Sizzle will be just fine.
Your vet should call you (or have someone call you) when they are finished, so you don't worry. They'll need to stay a few hours after that, so they can be monitored as they come out of anesthesia.
If there were no extractions and no complicating factors, there shouldn't be any need for medications. I always feed canned dogfood for the first meal (the vet says it's not really necessary, but I think they deserve a little babying.)
Do make sure they're running bloodwork before doing the dental--you want to catch any potential problems before using anesthesia. Also, if you're not sure about the anesthesia protocal, ask what it is and people here can give you feedback.