The former EastEnders actress, who starred as Ronnie Mitchell from 2007, attributed her battle to maturity.
"I feel safer behind a camera," she told Female First. "I certainly have more anxiety about live theatre because if you don't get it right, you can't go back.
"I really battle with it a lot more. It started around two years ago - it comes and goes. It's a really strange thing."
Womack elaborated further: "It's not based on any one specific thing, but I think it's more to do with when you get older, you consider everything much more.
"There's an arrogance of youth. Some days I can cope with it and other days I find it quite difficult. But what I do now is let people know that's the state I'm in rather than pretend I'm not."
The 40-year-old - who raises son Ben, 12, and 7-year-old daughter Lily-Rose - added that she finds motherhood and acting "very hard" to juggle.
Womack has been mourning for her late father, who committed suicide in 2009.
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