CHICAGO — Mitchell Robinson has been stressed — stressed watching from the sidelines as the Knicks ’ defense wavered, unable to do anything but wait.

“It’s been stressful, stressful to watch,” he said after morning shootaround at the United Center on Friday. “What I bring a lot to the table, we’re missing right now.”

The Windy City brought a much-needed therapy session for New York’s defensive anchor and starting center. Because Big Mitch’s big return is big-time for both the big man and the Big Apple.

Robinson was a full participant in practice for the first time since leaving the rotation on Thursday at DePaul University’s Sullivan Athletic Center, then announced his comeback himself with a two-word Facebook post — “I’m ready” — hours before head coach Mike Brown confirmed he’d pl

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