Aging showbiz legend Dolly Parton has been clobbered with kidney stone issues that forced the Jolene singer to cancel an appearance, and RadarOnline.com can reveal friends are fearful for her welfare because the country legend refuses to slow down.

The 79-year-old icon has been burning the candle at both ends since hubby Carl Dean died at age 82 in March. Article continues below advertisement

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"Dolly simply will not stop, and she's hardly taken a breath since Carl passed away ," confided an insider.

"Only a few days after he died, she made an appearance at Dollywood to celebrate the park's 40th annivers

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