I don't know how many you have left, how often your headaches are, etc. I would call and leave a message that you are worried about butalbital seizures if you run out before seeing the doctor; that should get someone's attention. Or, what I personally would do, is tell my pharmacist my problem; often doctors will talk with pharmacists or other doctors where they won't with the patient. He might be able to get you a few and will certainly be able to tell you how to taper your meds to make sure you are as comfortable as possible before your appointment.

Since you're dealing with a barbiturate and codeine, I'm sure the doctor has to check with you periodically, see how you're doing, take blood tests, etc. I'd give him heck if he hasn't been doing this for the 10 years you've been taking this med. From the problems caused from use of this drug (rebound headaches especially) I would not want to use this drug.