Yeah, I do that sometimes.
You missed two months of forgettable guild drama. I think I'm going to tell everyone about it here because it's been pretty ridiculous. Ridiculous online drama isn't very interesting, but the real life crap that was going on behind it is worth telling.
Later. For now let me get back on track.
Tip for the day: If you miss the zeppelin from Orgrimmar to the Undercity, get on the one to Grom'Gol instead. It'll arrive at the Durotar tower shortly after the one headed to the Undercity leaves. Shortly after it reaches Grom'Gol, the other zeppelin will arrive.
This is much faster than waiting another six minutes for the next UC blimp at Durotar. It also gives you the option of jumping off at the Bulwark. Careful, that's a longer fall than it looks - a little over 2800 damage for me last time I went, and I landed on a hilltop.