I've got a dentist appointment tomorrow afternoon, I'm due to have 2 fillings. At the moment, I'm experiencing terrible panic attacks and the mere thought of just sitting in the dentist waiting room is making me physically shake.

Is it worth visiting the doctor in the morning to find out if he'll prescribe me diazepam for the visit? Or are they reluctant to prescribe benzos for this type of thing?

Forgot to say, I've been prescribed Mirtazapine since April 2011. Is it ok to take both drugs?