Argh!

In 12 hours I have been sitting in dentists chair for 30 minutes. So basically 12 hours from now I am almost done or right in middle of teeth pulling. I will have local anesthetic, so I should be able to drive home. I have asked my friend if she can be a backup driver in case I can't. She said she could drive me home, if I need her to. OMG and all other things. All the svear words you can think of. Panicking! I hope I can get some sleep.