I tend to not agree with the Parkinson meme as Hillary has had these fainting type spells going back into her college days and early speaking engagements.
I lean towards it being epilepsy and stressful events can trigger seizures. I have heard the “over heated” excuse now 3 or 4 times for her and that is also a type of epilepsy aura that precedes a seizure event. She says she is getting warm and the team takes action to get her out of the situation. It would also explain why they didn’t take her to a hospital for an evaluation. People who have epilepsy don’t need hospital level medical attention unless they go status.
Now, if they cannot control her seizure events with medication or a RNS Stimulator then she is not fit to be President.