I'm guessing you started driving to Tioga Pass from near sea-level. You probably had a mild case of AMS then you started your hike up Mt. Dana, and should not have continued going higher. Yes, Diamox (not "diomax")will help, but you can only get it with a doctor's approval; it isn't a cure all. Herbal pills won't help much, if at all. Leave the oxygen at home; Mt. Whitney is not the Himalayas.
Yes, you can expect a recurrence of AMS at Mt Whitney, and be prepared to descend if you start to feel really bad.
Unfortunately, you experienced what a lot of us did on fast weekend trips from sea-level. It was part of the price we paid physically for bagging that big peak.
FYI:
https://www.drugs.com/mtm/diamox.html
