Sheryl CrowSheryl Crow is worried that her breast cancer will return, despite being given the all clear after treatment earlier this year.

Sheryl was diagnosed with the illness shortly after splitting from fiance Lance Armstrong in February and received preventation radiation therapy after the cancerous lump was removed.

But when the treatment ended, she didn’t stop thinking about it: “I dug into the Internet and tried to educate myself as to what I was looking at.”

“Even though you’re treated and you’re doing all the things that you are being told to do I still wake up sometimes feeling like, ‘Is this going to come back?’”

“The more I read about cancer, the more frightening it really is. There’s so many different kinds of breast cancer. There’s so much that we don’t know.”