Elizabeth Olsen used to have panic attacks "almost every hour"

She told The Observer newspaper: "[It was] multiple times [a day], like, almost every hour! ... It was literally, like, any time there was a shift in something: hot to cold, hungry to full. I thought, 'Oh, is this OK?' And then it would spiral and it just became this habit."

Olsen had to learn how to "interrupt the thinking process" and "figure out how to have some control", adding: "You learn very quickly who you feel comfortable around and who you don't."

She went on to reveal she also ditched wearing high heels - and if she had to wear them for a public event she put them on for a very brief period before taking them straight off again.

She added: "People thought it was a feminist choice. Like, nah! If I wear them and I'm standing in front of you guys, I'm gonna panic. I'd rather have my feet on the ground."

Olsen explained she's also had a fear of rollercoasters and a recent trip in a helicopter on the press tour for her new movie 'His Three Daughters' left her traumatised.

She said: "It was my first time in a helicopter. I hated it so much. It was like being on a rollercoaster for an hour and a half, even though it was probably 45 minutes. It was brutal. It wasn't for me. I just thought about dying the whole time ...

"I'll never do it again."

It comes after Olsen recently opened up about growing up in the shadow of her famous sisters Mary-Kate and Ashley revealing she was happy to stay at home while her siblings travelled the world.

She told The Times newspaper: "Anything that would take me out of school as a child, I didn't want to do. Even when my sisters would go travel the world every summer, filming these movies, I stayed at home and I did my musical summer camps.

"My sisters were on set all the time. What I saw them do was go to work. And what my friends and I did was play. I liked creating things with my friends." Elizabeth went on to add that she would "rebel" against her Hollywood star sisters - who retired from film acting in 2007 to focus on their work as fashion designers - by deciding that she did not want to be an actor and instead expressed a wish to follow a more corporate career path.

She added: "My version of rebelling was saying, 'Well, I don't want to be an actor, I want to be an accountant or I want to be an investment banker'.

"And so for years I said, 'I want to be an investment banker when I grow up,' because I was really good at math. Doing something that boring was a form of rebellion."