Hi Kumar,
According to my personal experience, I highly recommend Diamox. I did my hike yesterday. 3 weeks back I did Mt Dana in Yosemite to check my AMS level and I ended having severe headache and nausea. I came back and got Diamox for Whitney, till the end I had no issues of any AMS symptoms. Couple of my group member did not take Diamox and they were fine till 12000 ft. After Trail camp during the switch backs, they started to get mild headache. They pushed themselves and summited.
Another point to note based on my experience is the AMS symptoms for men is different from women. So make your call. Last min don't suffer after 12,500 ft.
