It is very unusual for a person to suffer a concussion when fainting. The body is so relaxed when fainting that you usually either just slide to the floor or just fall in a heap. Hilary has access to the finest medical care available, so she can get care and find out what caused it. Before I knew of her fainting I'd heard she was at her home resting after having some sort of 'bug'.
I do not have a link, but yes, there has been many mentions of Hilary's drinking. Many more mentions of her drinking than any other present politician of her stature. Another previous First Lady had a drinking problem. It is not unheard of regardless of any political affiliation.
I too find it very unfortunate to have to postpone her testimony on the Benghazi (sp.) tragedy. Her memory will not be as fresh. Dates and some details may become fuzzy.
Drinking knows no political affiliation, no gender identity, and no race identity. My son was killed because someone drank too much on Thanksgiving Day, 1999. Before this concussion business even came up about Hilary I had already noticed many pictures of her in a club overseas drinking and dancing, and in magazines as well. We all have our 'takes' of it and this is mine. None of us know what caused Hilary to faint, but it is very unusual to suffer a concussion when fainting.
When my youngest daughter was having her final wedding gown fitting, she fainted from not having eaten (wanted to be skinny for her wedding). She was rigid and fell straight on her face. Her knees had locked and she fell like a tree. Of course we called an ambulance. The doctor stated that when you stand for a long period of time, your knees can lock. Her nose was bloody but not broken. We were advised to watch her, but x-rays had shown she did not suffer a concussion in spite of the angry red bump on her forehead and bloody nose.
FWIW, I like Hilary Clinton. But even she is not immune to having a problem if indeed she does. Who knows?
MOO