This is very interesting: The doctor said she watched her get the right answer almost every time, then change it at the last second in a panic.
That's a great observation.
With the worsening of her condition, I, too, wonder about outside drug use. She does not know how to "use" properly because she cannot diagnosis, and everyone I know who self medicates just makes it worse. That's what doctors, dxes, and monitored pharmaceuticals are for.
I don't know what to say about your son.
Wish I could be of more help, but you are on the right path and are doing a good job.
{{hugs}}