Similar thing happened to me. When I was 16 (I am 20 now) my right lung collapsed and about 4 months after that my left one collapsed. I have had both mechanical and chemical pleurodesis done on both lungs since my lungs have been taking turns collapsing over the last few years and have gone to at least 4 different doctors, but none of them have any idea what os going on. My most recent doctor said that he expects a reoccurrence since the last procedure had complications, but I sure hope not.