I'm also 34 and I had the exact opposite happen to me this week. I popped a rib about a month ago and have been in a lot of pain. Decided to check out a spot the other night and while hoisting myself over a large make shift wooden wall, my rib popped back to where it belonged! Still tender but much better than before. I would bet the lack of sleep paid a big roll in your trip. When you go that long without sleep your body just can't hang. Us old folks gotta get our shuteye.