When I got my wisdom teeth out, I didn't drop but my endo had specific instructions for my dosing that day. You should talk to them before you go in and find out what they want you to do. I had the first appointment of the day, because they had a specialist from the hospital first thing just for people with diabetes who were being put under for surgery to test their sugars, etc etc, find out what the procure is for the office you're getting the work done at.
I would cancel if I were you..while I wasn't as out of it the second day..your face is swollen and talking is a BAD idea. when they tell you NOT to talk, you better not talk.You'll also still be in painkillers, so probably still a bit out of it.
I met my dad after a 13year of zero contact the day after my surgery at a coffee shop to catch up. I tried not to talk too much, but that three hours of chitchat was enough to cause real problems. I had my surgery on friday morning, and by saturday night the pain started to get worse after my afternoon out. on monday, i had to go to a funeral for a family friend who had died while i was in surgery, I cried because i was upset and because my face hurt so much.
When I went to the dentist for an emergency check-up later that day, i found out i had a canker sore running along the fold of my mouth (so where your face connects to your gums), and dry socket on the otherside. the dry socket was because i was talking when i wasn't suppose to say more than a few words once in a while and tried to eat something soft but solid, the canker sore was just to be an extra pain in the ass. when they tell you not to talk at all for a few days and to only eat liquids, you better do it haha.