It's not all that bad. Ever done body work on a car with bondo fill, grinding, drilling, and sanding? It smells, sounds, and vibrates just like that, but in your mouth. The drugs will work, unless you take drugs like weed recreationally. Go ahead and tell the dentist this because you will need more than normal. Follow all the dentist instructions, especially about icing afterwards and taking ibuprofen (not for the pain, but to reduce inflammation), even if you feel okay. The worst part for me was always how sore my jaw was just from holding it open so long. Don't try to go to work afterwards, it'll just interfere with your aftercare of ice to the jaw. Besides, you'll just end up drooling on yourself. It's not so bad really. You'll be fine.