LONDON — Britain’s Prince Harry has revealed that he struggled to come to terms with the death of his mother Princess Diana, finally seeking counselling after a long period of turmoil.

The 32-year-old brother of Prince William told the Daily Telegraph newspaper that he spent almost two decades “not thinking” about his mother’s death.

Diana, Princess of Wales, died in a car accident with Dodi al Fayed in Paris in 1997 as they were being chased by paparazzi on motorcycles. Harry was 12 years old at the time.

Harry told the Telegraph that he did not process his grief until he was in his late 20s: “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?”

He said he shut down his emotions after Diana’s death, which had “a quite serious effect on not only my personal life but my work as well.”

The prince said he sought help after his brother William told him: “Look, you really need to deal with this. It is not normal to think that nothing has affected you.”

Harry revealed that he finally sought counselling after what he called two years of “total chaos.”

Harry, his brother William and sister-in-law Kate are spearheading a mental health campaign, Heads Together.

The umbrella organization is the London Marathon’s charity of the year, and the royal trio are hoping to make the race what they call the “mental health marathon.”