What Chicago said. Staying hydrated during the hike is very important. I never drink enough because I don't feel thirsty during a hike; then afterwards, I drink like crazy to make up for it, and only then realize how much I should have been drinking.
Also, you might try hiking Mt Dana from Tioga Pass in Yosemite, rather than Clouds Rest on the weekend before. That gets you significantly higher. ...In fact, once you get to the top, sit around, maybe read a book. Spending more time at altitude is better.
