The star told The Sun newspaper that he struggled to cope while he was away from home for weeks as the band toured the US.
"I had a meltdown. Not a complete breakdown but I just lost it through the realisation of what was going on in my life," he said. "I went a bit mad for a couple of days."
"I panicked. I've never had that before. And I was at breaking point. But the band were there for me and crying helps.MTV
"I cry a lot and I'm not ashamed to say that but America was hard. It was nine weeks of non-stop touring. But we're doing all right there now, so it was worth it and we're going back there in the autumn."