Ravaged rocker Ozzy Osbourne is too weak to travel, prompting his devoted wife, Sharon, to cancel his appearance at this month’s Mad Monster Party for fans of horror and science fiction — and sparking new concerns for his health, sources said. “Things have taken a turn for the worse, and as always Sharon wants to protect him,” a tipster confided, RadarOnline.com can report. The 75-year-old heavy metal icon was diagnosed with Parkinson’s disease in 2003. And pals said he’s really been struggling since undergoing his fourth spinal surgery last September to try to fix damage from a 2019 fall, whi…