Last week the former N-Dubz star was acquitted of the charge of being concerned with arranging a cocaine deal worth £820.
The judge in the trial threw the case out after he had "strong grounds to believe" an undercover reporter for The Sun on Sunday, Mazher Mahmood, had lied during the course of the investigation.
Speaking about when the accusations were first made, Tulisa told Alison: "Everything just collapsed in nought point five seconds, my whole world just (crashed). I can't describe the emotions and some of the ways I felt throughout it.
"I literally felt like I was just drowning for the whole year.
"I haven't been able to talk or do interviews or any form of work for a year. I couldn't tell anyone what was going on...I just had to sit down and let them destroy me."
The singer admitted that during the course of the year she had hit rock bottom and on one occasion swallowed a number of painkillers along with an amount of alcohol.
She said: "There was a point when I was so paranoid I felt like I was an enemy of the state, I just thought: "What is going on here. What are they trying to do to me?" I was a nervous wreck.
"It's just been like an emotional roller coaster.
I lost a few friends along the way, I also gained a few, so it's definitely showed me a lot about the people around me.
"I've never experienced anything like this before and the lack of control and just feeling like: "Oh my God!" - it felt like a film.
"I've tried my best the whole way through it to be as strong as possible, but I've had my really low points where I've hit rock bottom, but I would just say to myself: "You've got to pick yourself up, keep going."
During the course of the trial at Southwark Crown Court it was revealed Tulisa had met Mr Mahmood under the pretence that he wanted her to star in a Hollywood film as an "urban" type character, possibly alongside Leonardo DiCaprio.
"I'm not the bad girl that's being portrayed, I never was," she said. "Looking back I should have been like: "This isn't right." But I just didn't see it, it was so extreme.
"(I thought) this is my moment, this was my big break to get away, it all felt so meant to be and it turns out it was actually the complete opposite."
The singer is now looking forward to getting her career back on track and says she is determined to learn from the whole experience.
She added: "You have to look at the positives in everything and the positive for me is how much I've grown as a person."