I would be interested to hear Rod, Ken's or Harvey Langford's opinions on whether your symptoms were AMS or whether something else was going on. Brent
There are several patients in this trip report!
Agree with Rod -AMS until proven otherwise.
Here are some generalizations..hope this helps:
Diamox does not always work.
Acclimatization does not always work for everyone, even with more of it.
The reported third-time-scenario suggests a "ceiling" for that individual and perhaps some of their kin.
You can continue to have AMS, or worsening AMS even with descent for an hour, a day, or longer. At the risk of sounding theatrical... at (usually) more severe altitudes there are people who continue to deteriorate and do die despite descent and care. They may progress from simple AMS to HAPE and HACE. It is sort of like.. once the process begins, it may get worse before it gets better. I am glad descent usually works.
Harvey