First, I'd ensure that there's nothing causing the handbrake lever to be hanging up or anything that might have kept the wheel cylinder from sliding as necessary. You could crack open the bleeder to relieve pressure, just in case that might have something to do with the problem. And you could back off the adjuster as much as possible. If all that fails, I'd try working my way around the outside edge of the drum with a hammer, alternating with trying to turn the drum/hub.
With luck, it'll all come apart again, and you can more thoroughly check things out when it does.