Therapy medicine symptoms and conditions

54 years old male on zocor (simvastatin) 40mg for 4 years, two years ago I start with problems in my shoulders (feel horrible) arms, hands and legs. Pain, numbness, cramp, tingling, muscle spams and weakness, my body is very weak.
I visited several doctors and pain management, therapy, medicine, nerve conduction test, MRI, CTscan, nerve block, carpal tunnel surgery, injection in my cervical and toracic spine I don't feel relief doctors doesn't knows the statin fault.
I found this page and I have been off zocor for 4 weeks and not relief yet.
Does any one know how long it takes zocor to get completely out of my system?