Gary,
It hit me at around 13,000' too. Started as a mild headache that then turned into a pounding headache and then without warning I skipped the nausea stage and went straight to vomiting. I dropped about 400' of elevation and laid down on a sunny rock and closed my eyes and napped for a little while trying to recover. And as told on the WPS site, I was awakened by by a very sharp stinging burning sensation on the tenderonis. Something, I don't know what, went up my shorts and stung or bit me through the mesh. The resulting adrenaline rush made me feel great...if not a little sensitive below the belt.
I had taken diamox before..but it gave me mild headaches. I am going to try again this year with smaller doses and building up until the day of the hike. But if I can't deal with the diamox, I am counting on the few days at altitude to avoid AMS.
Like you, I have the fever. I am already planning another one-day summit in September and planning next year's hikes (including a MR attempt)....and all the way out to 2013 when I am planning on doing the JMT.
