history: I have a dentist appointment tomorrow and it's starting to make me a bit nervous.  I have to get a filling replaced. I am so nervous.  I have to go to the dentist tomorrow to get a filling replaced.  Are you afraid of the dentist?
current: I am!  I had a bad experience with one when I was younger.
next: I'm sorry to hear that, I'm pretty terrified of the dentist myself. Ask for gas! Good luck, I'm sure everything will be just fine.