The Irish star and his family were left heartbroken after Ciarán, 57, died in a car crash at Ballymiles near Swinford in County Mayo in July.
Keating served as a pallbearer at his sibling’s funeral and also performed an emotional song at the end of the service.
Appearing on special installment of Loose Men, Keating shared how his weekly therapy sessions have helped him not only to deal with his loss, but also coming to terms with his rapid rise to fame as a teenager in Boyzone.
The 46-year-old shared: “I get my weekly session, I go to a therapist, and what my therapist does is give me the tools to go away and try to understand who I am, and what I’ve been through.
“Whether it’s trauma like losing my brother, or it’s adoration and all of a sudden that adoration is gone, how to deal with that – all these things, the highs and the lows.
“Somebody has to teach you how to deal with these things.”
Admitting it’s “been a very tough few months’, the singer said his bond with his siblings Linda, Gerard and Gary is stronger than ever as they come to terms with Ciarán’s untimely passing together.
The Dublin native added: “We’re struggling, to be honest, it’s been a tough few months dealing with it because it was so quick, so immediate, so fast, unexpected.
“We’re still figuring it all out. What we are doing is we’re talking to each other, and we have each other to lean on, and that’s really, really important. It’s all about communication and talking about it.
“But also, having somebody who’s going through something that feels the same, that you feel they understand what I’m going through. And that’s a big part of it for a lot of people.”
Keating added that he’s received an outpouring of support from fans – and even people on the street, which he said has given him comfort.
He continued: “People come up to you in the street saying, ‘Oh, I’m so sorry to hear about your brother, I lost my dad’, or ‘I lost my mum’ or ‘Ilost my brother’.
“And it’s their way of sharing and trying to be on a level with you and understand, but you’re in your own head. You’re in so much pain – it’s like, ‘You don’t understand, you don’t understand what I’m going through.’”
Loose Women airs weekdays at 12.30pm on ITV1