Just a brief word on Diamox. I have previously experienced headaches and nausea on prior trips above 10,500'. Always the first night and always feel fine in the morning. Just a difficult first night. As I only had one night on my recent Whitney adventure, I got a prescription for Diamox. I took one pill every 12 hours beginning 48 hours prior to ascent.
I experienced no headache no nausea. I felt strong all the way to the summit. No real side effects, just urinate a lot. I did hydrate very well prior to and during the hike.
My experience with Diamox was positive.