Broken (or Cracked) Rib

I did a stupid thing. I was reaching over the fence at the house trying to unplug a string of lights when I heard (and felt) a loud POP in my lower chest. I've had this happen before. A cracked rib and there's nothing you can do but wait for it to heal. That, and try to keep from re-injuring yourself -- which is what I've done this time. This morning, I woke up in a lot of pain. I must have slept on my chest. Deep breathes hurt. Twisting hurts. I just have to take it easy and remember to sleep on my back. And maybe get a bone density test and find out why my bones are cracking.