The 37-year-old singer admitted that he had been feeling 'jaded' before taking to the stage as part of the band's Progress Live tour, but said that the 'overwhelming' good feeling from the crowd did something strange to him.
Taking to his blog, he wrote, 'Oh my lord... Ireland!!!!!!!!!!!!!!!!! What did you do to me on Sunday night? I gave everything I had on Saturday and as expected your performance was better than mine... (only just).
'So much so that it was with a bit of trepidation that I made my way back to Croke Park the next day feeling a little jaded and drained from the night before... (such high highs there has to be a come down....). But I wasn't expecting what came next.
'I proper lost my s**t. The overwhelming good will, love, smiles, happiness, approval and acceptance beaming straight to the stage transformed me from preening peacock prima donna showman to a ball of mush within seconds.
'It was so powerful that I didn't know if I was going to be able to collect myself... proper floored.
'There's a tear in my eye thinking about it now. Yes, the gigs have ranged from brilliant to religious every night. But Sunday night (at) Croke Park was life defining. It will stay with me for as long as I live. Ireland I bow to you.'