Terry Collins returned to manage the Mets Tuesday night after spending Sunday night in a Milwaukee hospital with an undisclosed ailment.

Collins, 67, left Miller Park before Sunday’s game against the Brewers after feeling disoriented. He flew back to New York on Monday and was in his familiar spot for the series opener against the Pirates.

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“I feel great,” Collins said. “The doctors did a tremendous job. I’m really glad there’s nothing serious and I’m ready to go.”

Collins did not divulge what he was tested for other than to say “it was just one of those things where I was disoriented for a minute. I don’t know if it was dehydration, whatever it might have been. They don’t have any explanations for it. All I know is all the other parts that you worry about when you get to be my age are fine . . . Freaky things happen. So I’m just glad it’s done and I’m glad I’m sitting here where I am right now. ”

Collins said he received a flood of texts and emails after word spread of his illness.

“After I got to the hospital and went through the first barrage of tests that they gave me, I got back to my room and I had 83 texts and several emails,” he said. “It was very, very humbling and who they were from was certainly very special and I thank everybody for taking the time and thinking about me. I kind of thought I was going to be OK, but it’s nice to know . . . When the thing first occurred, I was pretty worried. But I got over it in a hurry.”

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Bench coach Dick Scott managed the Mets in their 5-3 loss to the Brewers on Sunday.