Following a lifesaving stay at St Patrick's Mental Health Services, he embarks on a mission to sustain his mental health and long-term well-being, while facing the joys and challenges of becoming dad to a set of twins.
The Young Offenders star admits that he very nearly "died of shame" as he was too embarrassed to talk about being depressed, to the point of becoming suicidal.
"When I started out doing comedy 25 years ago, the last thing I thought I would be doing was talking about mental illness," he admits. "In fact, I was trying to do the exact opposite.
"But my mission now is to have a conversation and try to get other people to have their own discussions on mental illness, and to know the difference between mental illness and your day-to-day mental health.
"I've learned that there is no right or wrong way to talk about it. No one is going to tell you that just talking will make you better, but you have to start talking to find what will make you better.
"I hope this documentary might in some small way help people to do that."
PJ Gallagher: Changing My Mind is a celebration of his progress and his commitment to extend that lifeline to those navigating their own mental health journeys, by partnering with advocacy groups and working to dismantle the stigma of facing mental health difficulties.
That stigma can be life-threatening for men in particular - suicide is the leading cause of death in men under 25, and yet Pieta House says that 70% of its service users are female.
PJ talks to researchers and psychotherapists, as well as meeting men’s groups that create connection and space to talk about the issues they are facing.
He investigates whether he has a diagnosis of ADHD, makes a fresh venture into mindfulness and talk therapy, and explores the potential of ground-breaking therapies like psilocybin, an emerging psychedelic treatment.
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