It does sound like a lung thing, perhaps a collapsed lung or one with fluids in it. Go see your doc, or go to a walk-in trauma center. My nephew had that gurgle thing when he had high-altitude sickness, said it was very eerie (and of course since he was 100 miles from being able to get down off the12,000 foot altiplano, he was actually in danger). One lung having a problem is not life-threatening, it is however something to get checked.
ps -- Climbing on a roof when drinking is not the best idea from a medical point of view, no matter what a peach of a move it seemed at the time. Even if you didn't get a collapsed lung, you could just as well have gotten dead, all you would have had to do is hit your neck on a corner of something hard in the fall. You might want think of some absolute rules for yourself that you feel could tend to preserve your life when you are impaired, such as "I will not let my feet leave the floor," or the obvious "I will not drive." Keep them simple so you can remember them when drunk, and only invent rules that you will really take seriously. They really might save your life.
I think Annie is right - I had this happen to a friend years ago - fell down totally drunk, broke a rib that punctured on of his lungs - he would have died if they hadn't got him to a hospital the next day