Lavigne was diagnosed with a sever case of lyme last year that left her bedridden for almost five months, reported E! Online.
The singer said she had no clue about the disease until her friends pointed out that there was something wrong with her.
"I could barely eat, and when we went to the pool, I had to leave and go lie in bed," she recalls, adding that she'd felt lethargic and lightheaded for a while.
"I had no idea a bug bite could do this. I was bedridden for five months."
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The "Girlfriend" singer believes a tick bit her sometime in the spring of 2014.
Lavigne spent time with family, watched movies and talked to fans using social media.
Her husband, Chad Kroeger, 40, checked in during breaks from his tour with Nickelback, and for a while, Lavigne's mother moved in to help take care of her.
"There were definitely times I couldn't shower for a full week because I could barely stand. It felt like having all your life sucked out of you. I felt like I couldn't breathe, I couldn't talk and I couldn't move. I thought I was dying."
"This was a wake-up call. I really just want to enjoy life from here on out," she said.