We've been following Janet Yellen's speech today:

Which was somewhat overshadowed by the health scare towards the end:

The Wall Street Journal to wrap it up:

Federal Reserve Chairwoman Janet Yellen faltered near the end of a nearly hour long speech

A spokeswoman for the U.S. central bank blamed dehydration

"Chair Yellen felt dehydrated at the end of a long speech under bright lights," Fed spokeswoman Michelle Smith said in a statement. "As a precaution, she was seen by EMT staff on-site at U-Mass Amherst. She felt fine afterward and has continued with her schedule Thursday evening."

Added - ungated video is here

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I'm no doc, but it did look quite serious. Its great news that she is well.

There is a video at the article (may be gated): Janet Yellen Seen by EMT Staff After Speech in Massachusetts