You should be able to go to your GP or local ER to get a refill, too. You can even go to a walk-in clinic. I've had to do that when I've run out by accident (Pdoc didn't give me enough refills/she cancelled or I cancelled).

Just bring your old bottles as proof of what you're on and what dose and figure out how many days you actually need and ask for only that. I've never had a problem with getting refills from a GP, walk-in-clinic, or ER.