Glad you're okay. You might want to practice your braking a bit in an empty parking lot somewhere. Sounds silly, everyone knows how to brake, right? But there's more to it than you might think. A skid can be caused by too much rear brake and not enough front; maybe that's what happened to you. Sheldon Brown has a good article on braking technique. One thing I learned just recently is to shift my weight back when braking hard, to prevent going over the bars, which is what many people fear from the front brakes. Maybe you already know all this, so I don't want to patronize you if you do, but if not, check out Brown's article and go practice!

Here's an interesting thing to try in an empty lot. Get up to speed, then stop as quickly as you can with just the rear brake. Measure how far it took to stop. Now practice a bit using just the front brake, lifting your butt off the seat and back to counterweight the bike's forward momentum. When comfortable with that, try the same stop you tried first, but with just the front brake. It should be a lot shorter distance. Now try lastly with both brakes (remembering to shift your weight back again), and that distance should be shortest of all. Practice until second nature.