Pectoral muscle symptoms and conditions

I have taken statins for over 10 years. I suffered muscle aches and cramps but put it down to my age (56) However recently I noticed weakness in my chest when weight training.
It was then I realised that my left Pectoral Muscle had all but disappeared, leaving just flabby skin. The right side is still firm.
A visit to the doctor and subsequent blood tests showed abnormal levels of harmful Enzymes. I was taken off statins immediately but would like to know if the muscle damage is permanent or will it recover over time.