The actress also had to deal with losing her dad to cancer, last December.
She was left battling with depression and anxiety, after landing her dream job of Fanny in Funny Girls.
Opening up about her breakdown, Sheridan revealed she was left insecure over her work.
“My life was falling apart. And I didn’t tell anyone,” she told Culture magazine. “So you think: ‘That’s it. This is me. I’m unloveable, I’m inauthentic.’ And you can’t see how that will change. You have to learn to shut the brain off, the voices, but I couldn’t.
“It was Legally Blonde that changed everything – it was the first time I’d been the lead in a musical, and it did incredibly well.
“The next thing I’m in a play with Sienna Miller, Dustin Hoffman sees it and puts me in his film. Then things started to go to another level.
“Suddenly I started suffering from anxiety. I’m there on set with Dustin Hoffman, Maggie Smith and Michael Gambon, and I was really anxious.”
She continued: “You’re constantly worrying you’re not going to be as good as people think you should be.”
“When you have that degree of anxiety, you can’t just pull yourself together and you can’t explain it. It just snowballs until it’s out of control.”
Sheridan – who has an album on the way – also explained she felt she couldn’t talk about the reasons behind her breakdown, over fears she would become ‘unstuck’.
“I didn’t want to talk about it because I just thought people would say: ‘What have you got to be upset about?’ And I was totally grateful.
“But at the same time, I was totally terrified that I was going to come unstuck, that I couldn’t hold these feelings of insecurity in much longer without it coming to a head. Which it did last year. My dad getting cancer triggered it, but it had been a long time coming.”
The 36 year old also vowed to make her life more simple, and only take on one project at a time.
“I’m not going to run myself into the ground again,” she added.
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