A few years ago my Mother was diagnosed with Alzheimer's. Since then, she has seen a baker's dozen of doctors, each prescribing drugs with more, and worse, side effects.
A couple of weeks ago, one of my Sister's clients (a psychiatrist) noticed my Mother's odd gait and spent a few minutes talking to my Mother. Her diagnosis was that my Mother did not have Alzheimer's, and sure enough, a bit of surgery seems to have solved my Mother's mental problems.
Now, my Dad is a Ph.D with several years of med. school, and he had assured me several times that every aspect of the Alzheimer's diagnoses had been double checked.
I guess those doctors were not as careful as they said they were.
Aaron