Here's my experience coming from sea level:
I had nausea "like a boss" from just below trail camp both times I day-hiked whitney (this year and 5 years ago), and both times with diamox. I pushed through both times and made it. Many people give up and turn around by trail crest. Most of the people I talked to on the switchbacks that were going slow had the same symptoms I did, with nausea subsiding while resting or not going up.
If the altitude doesn't tear you up, just remember you'll naturally feel horrid from exhaustion, and remember to add plenty of hydration.
You should probably talk to your doctor about adding a nsaid like ibuprofen also. I'm a big time coffee drinker and didn't have any on the day of my hikes, so naturally you might get a caffeine headache. I actually did not have a headache either time but took otc aleve.
Last edited by retarded; 08/21/17 07:02 AM.