Tom Brokaw -- Hospitalized in Charlotte, North Carolina

7:03 AM PT -- Brokaw just Tweeted about his condition ... assuring his fans he's OK.

"All is well Early AM I mistakenly took a half dose of Ambien and made less sense than usual. Made a better comeback than Giants ..."

Tom Brokaw was rushed to the hospital in Charlotte, North Carolina this morning after the longtime newsman reportedly felt light-headed.

The 72-year-old former "Nightly News" anchor -- who is in N.C. for the Democratic National Convention -- had appeared on MSNBC's "Morning Joe" this morning when he began to feel ill.

A rep for MSNBC says ... "On the set of 'Morning Joe' this morning, Tom Brokaw felt light-headed. Out of an abundance of caution, he was taken to a hospital and is being evaluated."

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