Is Hillary epileptic?
Those strange blue "sunglasses" Hillary has been wearing lately have now been identified as Zeiss f133 glasses, designed to prevent epileptic seizures. Can America afford an epileptic as Commander in Chief? Others are writing a lot on this (e.g. here) but you can be sure that vast efforts are being made to prevent any hard information getting out.
Even so, I think Hillary is finished. Her age has caught up with her. Those old bones can't hack it anymore -- unless she has a body double of course.