Obviously, the altitude didn't effect you as much as everyone else. Give it a couple of days and you'll be right as rain ;^)
Last time I was there my experience was that the first day hits you hard, then it gets better till by about the third day I was feeling pretty good. So by the fifth and sixth days you'll be killin it!
I hope that's the case! We got way up in the mountains today, so maybe that will help speed up acclimatization
And think of how awesome you'll feel when you come back to sea level. You'll be superwoman!