Pocket hole screws are tough, but don't survive impact drivers. I prefer using an electric screwdriver. It's a little slower, but you can feel when the screw head bottoms out. Get yourself one of the single pocket hole guides and clamp it adjacent to your broken screw pocket hole and drill a new hole. Then install the screw (with wax) using a screwdriver or electric screwdriver. I keep one of these single wide Kreg drill guides handy for adding pocket holes during assembly when I find that I have forgotten one, or when something goes wrong, requiring a new pocket hole where the big pocket hole guide cannot be used. I hate the sight of pocket holes, but like the quick assembly that is possible by using them, so I only use them where the completed project assembly makes them invisible (underneath, inside and hidden, etc.
Charley