Greg Page quit the band five years ago to focus on getting better

Greg Page was known for years as the Yellow Wiggle in the popular children’s band The Wiggles. But in 2006, he abruptly left the band.

Now that he’s making his return, the Aussie performer, 40, is opening up in the new issue of PEOPLE (on newsstands now) about the health crisis that drove him to leave the group for five years.

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“I had to do it, for my health,” Page says, describing a period of time during which he experienced fainting spells – once after greeting a young fan – and loss of sensation that had him in the doctor’s office being tested for everything from SARS to epilepsy. “It was driving me mad, not knowing what was wrong with me.”

Page learned that his condition was called orthostatic intolerance, a cardiovascular condition that was causing all his mysterious symptoms. The disease can be managed with medications and lifestyle changes. “Just knowing that what I had had a name, and it wasn’t terminal, and it could be treated was wonderful,” says Page. “I feel like I’m getting a second chance.”

The band will be touring the U.S. this summer and you can see Page already performing with The Wiggles again in the clip below.