McFLY star Danny Jones needed therapy after his dad left the family home – and they still have not healed their rift.
The Voice Kids coach was 18 when his father walked out on his mother.
The trauma triggered anxiety attacks – so he turned to his McFly bandmates, who revealed they too were having mental health problems.
Danny said: “It’s lonely. It’s like having a massive shopping list of worries. If someone reminded me of dad, that would trigger it.”
The 33-year-old is supporting a physical activity campaign from PHE’s Change4Life and Disney UK, inspiring kids to get active with 10 Minute Shake Up games this summer.

Danny is currently a judge on The Voice Kids, and joined with his judging panel on the Manchester Metro to sing some songs in the middle of rush hour.
Danny gave them a song on his guitar and started playing Back Eyed Peas hit 'I Gotta Feeling'.
Will.I.Am was really feeling in the mood and started banging his fists on the windows.
The rapper then climbed up to the ceiling and started thrusting his crotch while placing his feet on the walls.
Everyone started singing along and began clapping when they finally reached their destination.
Danny said: "That's how we get to work every morning. Not too late are we?"
The coaches then walked arm in arm into the studio before settling down for the first audition of the day.

But the foursome broke the rules as travelling rules state that no one is allowed to perform with or without an instrument on the tram, but the judges probably got permission before they got on board.
The Voice Kids viewers took to Twitter after watching the coaches get to work on the tram.
One viewer asked: "Why wasn’t I on that musical tram with Jessie"
"Would not cope with those 4 coaches getting on my tram very well tbh," added another.
A third said: "What I would have given to be on that tram with them"