Avril Lavigne has had not only the biggest comeback of the year, but perhaps of any year in recent memory.

The singer was suffering from Lyme disease, which she was diagnosed with in 2014, and says that at points she was worried for her life. In September, she released a new single, Head Above Water, which is also the name of her new upcoming album — her first since 2013.

The singer, who was diagnosed with Lyme disease in 2014, has released a new breakup song, Tell Me It's Over. 4:45

"At one point I thought I was dying, which is literally the night that I wrote Head Above Water," she told q host Tom Power. "I sort of accepted the fact that I was just gonna die. But what was sort of beautiful and good for me was to see how much I love music, and how it lives in me, because when I was going through all that I was just naturally writing songs from bed."

Lavigne also just released a second song, Tell Me It's Over, which she says is about, "closing the door on a relationship that is maybe, it's just been a very passionate, heated relationship. It's like really on and off," she says. "You have these really intense feelings for someone and there's a lot of love with this person but you know it's not good for you anymore."

In the song, a soulful, sombre ballad with piano and horns, and a marked departure from her previous forays into pop and punk, she sings, "My heart, oh no, is not your revolving door / I get stuck spinning and spinning and spinning til I collapse on the floor."

Lavigne, for her part, is happy to be back and feeling healthy again.

"I took a hiatus because I needed to for my health," she says. "Got through that and started making music. So to be able to come out with Head Above Water was really meaningful to me because, at one point, I wasn't sure if I was going to be making music anymore."

Lavigne's new album, Head Above Water, will be released Feb. 15, 2019.