Transcript for Creed's Scott Stapp Reveals He Suffers from Bipolar Disorder
You know, when you're the lead singer of a multiplatinum rock band, sex, drugs and rock and roll isn't just a clever phrase, it's a way of life. But for Scott staff of creed, the good times came crashing to a halt when an undiagnosed mental illness spiralled out of control. Now he's confronting it with newfound sobriety and a beloved wife who helped save him. Coming clean to ABC's Matt Gutman for a "Nightline" exclusive with "People" magazine. ? Welcome to the place ? Scott staff is the shaggy-haired former front man of the megaband creed. The heart throb had multiplatinum albums with an them like "With arms wide open." Reporter: And songs like "Higher." ? Can you take me higher ? But the family plan sure seemed low, stealing this motorized supermarket scooter late last year. Why was he making maniacal calls to his son's school. Then he posted these creepy videos on Facebook. I had to sleep in my truck. I had no money, not even for gas or food. I went two days without eating because I had no money. Reporter: Fuelling speculation by many that he was on some meth binge. It was worse for staff, he was in the midst of a 5-month-old psychotic episode. I've reached out to the secret service. Reporter: How close did you think at that time you were close to losing him? I expected to get a call like something tragic. Reporter: He wasn't dead but he was in hell. I made crazy accusations toward my wife. I thought people were following me. I thought there was a government conspiracy to drug me. Reporter: He says his descent began in 1998 just when he started soaring, telling ABC news his nose dive began just after creed's multiplatinum debut album "My own prison." I had four number one singles. My career was take off. Then all of a sudden the depression came over me. Reporter: Today he says the years of substance abuse was self-medication for undiagnosed bi-polar disorder. I didn't want to return to street drugs. I deceived myself. And knowingly went in to see a doctor having the previous diagnosis it made it easy for him to prescribe me aderol. In August of las year with a legal, doctor-prescribed medication which he now admits as an addict he shouldn't have sought out. Did the doctor know you'd had addiction problems in the past? I hid that from him. I did what alcoholics and addicts do. I lied. I started taking more. And I got up to taking double the legal dosage. I told him, if you don't stop this I'm going to leave. That's when I checked myself into the holiday inn. And I abruptly stopped the medication. And basically that was like throwing fuel on a fire. Reporter: But it got worse. It started off on a one-man driving tour across the country, a ticking time bomb. I threw a bunch of stuff in my vehicle when I left. All my weapons that I had collected over the years. I was an avid gun collector. I felt compelled to give away some expensive artwork to a church. Three Salvador dali sketches. Somewhere in Mississippi. You don't even know what town. No, I don't. You just happened to vet in your truck? I had them in the back of my truck, yeah. Reporter: His wife filed for divorce. She claimed he was irrational, incoherent, delusional, psychotic, dangerous and needs to be involuntarily committed to a mental facility again. I also called the white house two or three times. I was certified crazy. Reporter: Throughout the ordeal, his wife, who says she never stopped loving him, was texting him and sending him pictures of his family, pleading with him to get help. I mean, at one point in time I thought that I was some type of programmed agent for the cia. The more your deelusion persists the more it actually sounds like the bourn identity. I thought that I was Jason bourn. I thought I was just like that. Reporter: In November 2014, staff called 911. I had called 911 because I thought I was having a heart attack. I was in such fear. Reporter: He sounded so insane the state of Florida baker acted him, meaning it forecefully institutionalized him. What's amazing is that in the moment of your greatest insanity and hallucination, something pulled you out of that that you decided to call 911 and that you allowed yourself to be treated. I can tell you what it was. What was it? It was love. It was my love for this woman and my love for our family. Reporter: And just after Christmas, 2014, Jaclyn flew to L.A. To talk. Scott checked himself into a treatment facility, and it was only then that they learned the source of the psychosis. He was diagnosed with bi-polar disorder, a mood disorder characterized by unexpected shifts in moods. Well, I was in denial. I didn't want to be bi-polar. It had been mentioned. I just wanted to be someone who suffered with bouts of depression. I was willing to accept that. And this episode really broke me. Reporter: After a nine-month ordeal, suffering in silence, the couple is speaking out. Also opening up to "People" magazine to bring awareness to bi-polar disorder. And their struggle to stay together. Jaclyn, not only did he freak the family out, but he humiliated you guys. Can you forgive him for all that's happened? I mean, I can definitely forgive. I don't know if I can forget it. I mean, it's forever. But I have to. I have to forgive. I can't let this haunt me forever. I'm writing a lot of songs for my wife right now. Reporter: And with that diagnosis, the man who says he was caged by this disease finally getting the right treatment. His road trips not much longer these days than strolling to the lake behind his Florida home. I come out here every day and try to meditate. It's the first thing that I do. I wake up in the morning. It's just something to get my thoughts outside of myself and on something bigger. And just kind of focus on what really matters in my life. And you know, that's my family. Reporter: For "Nightline," I'm Matt Gutman, boca raton, Florida. Now, that's what I call a happy ending. "People" magazine on stands now.
This transcript has been automatically generated and may not be 100% accurate.