Fergie really opened up Sunday on “Oprah’s Next Chapter” on quite a few personal topics. First, we reported on what the Black Eye Pea had to share about infidelity rumors hitting her marriage. Now, we will tell you about how the pop icon quit using drugs.

“At first, with any drug, it’s great in the beginning,” Fergie started saying, adding, “then slowly your life starts to spiral down. (I was) 90 pounds at one point.” Fergie admitted, “My brain had been playing a lot of tricks on me…You’re kind of living in this alternate reality.”

Fergie went on, “I started getting really paranoid. So I went one day into this church and I thought that the FBI and the SWAT teams were outside the church.”

While Fergie was inside the church hallucinating about what awaits her outside, she held a conversation with God, making a deal with Him which would change her life for the better. “I said, ‘Alright, if I go out there and the FBI and the SWAT teams are not out there, then it’s the drugs and I’m stopping.”

Of course when Fergie went outside, she realized there were no FBI or SWAT teams waiting for her. So, she had to make good on her end of the bargain – and that’s how she’s been clean ever since.

Fergie elaborated that she first started taking drugs as a teenager, including crystal meth, when faced with stresses which go along with being in the ’90’s group Wild Orchid at such a young age. Due to her drug use, her career got stagnated as she felt unable to tell her band mates of her dreams to split off and start her solo career.

“What I should have done was said, ‘Girls, it’s really time for me to go [out] on my own. I need to fulfill this dream of mine to have a solo album.’ And I didn’t know how to do that, I didn’t know how to deal with that confrontation,” she said.