DENVER -- New York Mets right-hander Matt Harvey has no explanation for his subpar season.

"From one start to the next, it doesn't feel the same at all," Harvey said Friday, after allowing five runs on 11 hits in 5 2/3 innings in a 5-2 loss to the Colorado Rockies. "So, for me, it's frustrating. It wasn't the ballpark or anything like that. It was me. ... I'm just not feeling comfortable throwing the baseball right now. It's frustrating. Something I've obviously done my whole life is gone on the mound and thrown a baseball. And right now it's not an easy task. I've got to keep my head down and keep focused and keep pushing to figure it out."

Harvey dropped to 3-5 with a 4.93 ERA. He insisted he is not injured.

A troubling sign for the Mets: Matt Harvey's fastball averaged a season-low 93.2 mph in Friday's loss to the Rockies. Photo by Justin Edmonds/Getty Images

"My body feels fine," he said. "It's just frustrating being out there right now."

Asked if he had ever struggled like this before, Harvey cited his sophomore season at the University of North Carolina.

"But it was pretty quick and didn't really last this long," Harvey added. "It's frustrating. It's taking a lot longer than expected. You can't give up. You've just got to keep going."

The struggles are wearing on Harvey, potentially exacerbating his performance.

"Right now, just not feeling great out there, you start overthinking pretty much everything," Harvey said. "That's the way it kind of feels every pitch. Hopefully we can get past that."

Manager Terry Collins suggested that pitching coach Dan Warthen is working with Harvey on trying to correct his release point. Harvey deflected a question about whether that was an issue.

"There's a lot of unknowns," Harvey said.

He acknowledged that his outings unravel in the middle innings. The Rockies scored twice in the fourth, once in the fifth, then twice more in the sixth against Harvey on Friday.

"Certain pitches, it's fine," Harvey said about his mechanics. "But it's progressively getting worse as the game goes on."

Harvey had seemed to turn a corner during his most recent start, when his fastball averaged a season-high 96.5 mph in San Diego. Instead, he reverted to his previous struggles against the Rockies. His fastball averaged a season-low 93.2 mph.

"It's start to start for me right now," Harvey said. "I don't look at it as ups and downs. It's trying to continue figuring stuff out. ... It's not easy, but there's another day tomorrow. And it's a long season. There's a lot of hope in that regard and drive toward figuring it out."