Prince Harry has opened up about his near-breakdown following Diana's death.

Prince Harry has revealed he sought counselling after two years of “total chaos” after spending nearly 20 years of “not thinking” about the death of his mother.

Harry was 12 when Princess Diana was killed in a car crash but he said it was not until his late 20s that he processed the grief.

The 32-year-old has told the Daily Telegraph he tried to block out the pain.

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Prince Harry in 2016. Source: Getty.

"My way of dealing with it was sticking my head in the sand, refusing to ever think about my mum, because why would that help?

"(I thought) it's only going to make you sad, it's not going to bring her back. So from an emotional side, I was like 'right, don't ever let your emotions be part of anything'.

"So I was a typical 20, 25, 28-year-old running around going 'life is great', or 'life is fine' and that was exactly it.

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Prince William, Princess Diana, Princess of Wales, and Prince Harry in 1995. Source: Getty.

"And then (I) started to have a few conversations and actually all of a sudden, all of this grief that I have never processed started to come to the forefront and I was like, there is actually a lot of stuff here that I need to deal with."

He said he shut down his emotions after her death which had "a quite serious effect on not only my personal life but my work as well".

The prince sought help after Prince William advised him that he had to deal with the grief.

Harry said coping with the death of his mother while in the public eye had led him to coming "very close to a complete breakdown on numerous occasions".

He said boxing "saved" him after he took it up to deal with his aggression, after nearly "punching someone" when he was 28.

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Prince Harry as a toddler with his mother, Princess Diana. Image via Getty.

Asked whether he had ever been to see a "shrink", he replied: "I've done that a couple of times, more than a couple of times, but it's great."

But he said that he was now in a "good place".

"Because of the process I have been through over the past two and a half years, I've now been able to take my work seriously, been able to take my private life seriously as well, and been able to put blood, sweat and tears into the things that really make a difference and things that I think will make a difference to everybody else."