I don't know about your situation, and would be guessing. With me, my breakthrough pains are either "electric" type shocks in the joints, a feeling like a carnivorous worm is eating the flesh way deep, or a sudden increase in throbbing pain. They made life very difficult indeed when they were common, and still stop me occasionally and take the breath away.

It's impossible to do almost any activity or even think when that happens. I don't react with any fear or anxiety because I know that it will pass, and what to do to make it happen less frequently.