Avril Lavigne says her battle with Lyme disease was a struggle — first to get a correct diagnosis, then to recover. Earlier this year, the 30-year-old Canadian singer revealed that the disease had left her bedridden for five months, and fearful of dying.

She fought for months to get a diagnosis, consulting with doctor after doctor, and seeing no improvement until she was finally properly diagnosed on her 30th birthday in October.

"I was in Los Angeles, literally, like the worst time in my life," Lavigne told "Good Morning America" in her first on-camera interview since her ordeal began. "I was seeing, like, every specialist and literally, the top doctors, and they were so stupid, and they would pull up their computer and be like, 'chronic fatigue syndrome,' or 'Why don't you try to get out of bed Avril, and just play the piano? Are you depressed?'

"This is what they do to a lot of people who have Lyme disease," she said as she broke down in tears. "They don't have an answer for them so they tell them, like, 'You're crazy.'"

Lyme disease is a bacterial infection transmitted to humans through the bites of infected blacklegged ticks, according to the Centers for Disease Control and Prevention. Symptoms include fever, headache, and fatigue. If untreated, the infection, can spread to joints, the heart, and the nervous system, but most cases can be successfully treated with antibiotics.

In Lavigne's case, antibiotics and a lot of rest were the key to her recovery. She revealed to "Good Morning America" that she's about halfway through treatment and is "doing a lot better," and is expected to make a full recovery.

Lavigne says her ordeal was a wake-up call, and she wanted to enjoy life. "I think for me it's a second shot at life," she said. "I want to go out there and truly do what I love, so I'm so excited for life after this."