The Womanizer singer, who suffered a public meltdown and was hospitalised twice earlier this year, has revealed throwing herself into work helped get her life back on track.
She said: "Everybody has a world that they create around themselves. If I have a lot of nervous energy, when I start dancing it goes away and I just feel emotion. It's like a rollercoaster.
"People think that if you go through something in your life you need to go to therapy, but for me art is therapy because you are expressing yourself in such a spiritual way."
The 26-year-old star - who is set to embark on a world tour to promote her new album 'Circus' next year - also admits she struggles to speak to her loved ones about her problems.
She added in a promo for her TV documentary 'Britney: For the Record': "Sometimes you don't need to use words to go through what you need to go through. Sometimes it's an emotion that you need to feel when you dance, that you touch on and the only way you can touch it is if you move a certain way."