Avril Lavigne, slowly on the upswing in her Lyme disease battle, says she found many doctors’ passive dismissal of the illness as “unacceptable” and “frustrating.”

The “Sk8er Boi” singer, speaking with Good Morning America Thursday in a phone interview, explained how a year ago, she “went from doctor-to-doctor for about eight months” until she could find a physician qualified to deal with it.

Most, she said, were quick to diagnose her sickness as dehydration and exhaustion.

“I actually knew I had it the whole time,” the 30-year-old singer said, “and was just up against a lot of doctors telling me, ‘You’re crazy.’

“Some of them were like, ‘It doesn’t exist.’”

Lavigne, who has sought support from Real Housewives Of Beverly Hillsstar Yolanda Foster (also battling the disease), said she’s “gained a lot of perspective [in her] life” as she fights the sickness.

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