"Actually going through Invictus and speaking to all the guys about their issues has really healed me and helped me," Harry, 32, said in a new interview with Dave Henson airing today in the U.K. on Forces TV. "I have got plenty of issues. None of them really relate to Afghanistan but Afghanistan was the thing that triggered everything else and the process."
“If you lose your mum at the age of 12, you have got to deal with it,” Harry said. “The idea that 20 years later I still hadn’t really… that 15, 17 years later I still hadn’t dealt with it. Afghan was the moment where I was like, ‘Right, deal with it.'”
Harry, who shared earlier this year that he sought counseling in his late 20s, told Henson how he overcame his own fears to ask for help.
"I was like, 'Right, you are Prince Harry. You can do this. As long as you're not a complete t-- then you are going to be able to get that support because you've got the credibility of ten years' service and therefore you can really make a difference," he said.
Harry spoke with Henson, a Paralympic medal winner, to promote the 2017 Invictus Games, which will be held next in Toronto in September. The fifth-in-line to the British throne launched the Invictus Games in London in 2014 and credits the event with helping him conquer his own demons.
"Yeah, 100 percent. For me, Invictus has been sort of like a cure for myself," he said.
Harry also revealed in the interview details about the panic attacks he said he suffered at public engagements.
"In my case, suit and tie, every single time I was in any room with loads of people, which is quite often, I was just pouring with sweat, like heart beating – boom, boom, boom, boom - and literally just like a washing machine," Harry said.
Harry told The Telegraph's Bryon Gordon in April that he "shut down all [his] emotions” for almost two decades after Diana's death.
Harry told Henson that he wanted to help himself so he could help others.
"When you can get your own head and self back on the right path, the amount of people you can help is unbelievable because you can tell the signs in people," Harry said. "You can see it in their eyes. You can see it in their reactions."