Don't freak <img src="i/expressions/face-icon-small-wink.gif" border="0"> - it's okay. It may not even be clubbing- he may have even just hurt the nail bed or something if it's just one funny shaped nail, and it's just growing out/growing funny. Just mention it to his dr next time, and see what he says. I think alot cfers have it <img src="i/expressions/face-icon-small-wink.gif" border="0"> .
No, I don't think there is anything you can do about it except just keep on doing his stuff like you're supposed to.
I have slight clubbing of my fingers and toes- but I was <b>born</b> with it <img src="i/expressions/face-icon-small-wink.gif" border="0"> . I have my (paternal) grandmother's hands and feet(also long and skinny-lol). My dad's also look like mine. I didn't have any lung problems (except one bout of bronchitis when I was 13) until I was 16, PFTs in the 100's. It used to drive me nuts when a new doctor would look at my fingers and toes and say "mild clubbing". I would always say "But it's not from my cf! It's my grandmother!"