Clooney injured his back while filming upcoming movie Syriana, and started getting agonizing headaches after doctors operated on his neck.
It then took a while for Clooney's condition to be successfully diagnosed, at which point doctors performed 'spinal cap' surgery. The star, who had to wear a neck brace for a while, has now nearly fully recovered.
Clooney's publicist Stan Rosenfield tells website Pagesix.com, "He was getting tests and the doctors were saying, 'There's nothing wrong with you,' but he was having horrible headaches. He was in excruciating pain."
And, so bad was Clooney's discomfort, he was forced to pull out of promotional duties for sequel Ocean's Twelve.
Rosenfield adds, "He was supposed to leave for New York on Nov. 28, but he couldn't. And he was supposed to leave for Europe on Dec. 8. He actually drove to the airport, and said, 'Guys, I can't do it.'"
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