Same thing happened to me. The medical term is Spontanious Pnuemothorax. The first time I was in the hospital for about a week and a half. That sucked. The only good part was that I was in the Army and the whole time I was off work, I still got paid. The 2nd time, I was on leave and still had 2 days left of hunting season. I knew what it was so I told my wife. She wanted to take me to the hospital, but I wouldn't let her until after I got my deer. Got my deer the next day, went home and did all the fun stuff with it, and then I told my wife she could take me to the hospital. The 2nd time I got a procidure (don't remember what they call it) were they scuff up your lung and your chest cavity and let them heel together so it is less likely to happen again Don't now if it would work for you, but you might want to ask your doctor about it. And yes, it is the most uncomfortable thing I have ever been through.
Sorry about the long post! Good luck.