So Donna, why DID Hillary collapse in this street outside the 9/11 Memorial service??? Enquiring minds want to know! What IS her biggest health problem? I suspect we will never know, but it is interesting to speculate.
She previously wore fresnel lens glasses, which are used to treat blurred vision
She has also wore blue lens glasses, which are used to treat symptoms of Parkinson's or dyskinesia (involuntary movements)
She has publicly had some episodes of what appear to be tics, involuntary movements, tremors, repetitive speech, and odd pauses in speech
She has publicly had at least one incidence where she completely lost her equilibrium and the ability to stand upright on her own, as well as several reported but non-public instances of falling down.
Add up the italicized symptoms and they definitely point to a neurological disorder or brain injury.