Wonderwoman, if you are going to prusik up double ropes after a belayed fall, it makes more sense to prusik on just one strand and be belayed with the other strand. That way you don't have to tie back-up knots in the rope to protect yourself in case the prusiking system fails in some way.
That's exactly what I did. I ascended the rope that was clipped into the next piece of gear, while my belayer took up on the other rope. I didn't have to go far to get back on the rock, thank god. But there have been instances where I've had to prusik for longer than I would have liked. It's tiring. It wouldn't make any sense to try to ascend both ropes, especially when they were going in different directions. Unfortunately, I am not a prusik n00b.