Muscle Disorders :: Generalised Stiffness And Right Calf Muscle Wasting

When in bed at night I struggle to turn over or move as I feel so stiff and sore. Once out of bed and moving I am much better. I initially find it hard to become upright after sitting for any length of time. About 2 years ago my daughter noticed my right calf was much smaller than my left one. I cannot raise my self onto my toes on my right leg due to loss of muscle/strength in the affected leg. 

I have had blood tests, nerve stimulation tests and a muscle biopsy. My CK level from my blood tests was slightly raised, my nerve study tests were abnormal and my biopsy only showed minimal change. 

I now cannot raise my arms above shoulder level to the front and if I walk at a quicker pace my lower back feels like I have no support and I get pain around my lumbar region. 

I go spinning 4/5 times a week and cope with this very well. It's as though once I'm warmed up my stiffness diminishes. I am 51 and have only one period every 3/4 months , I have been to the dr's re the menopause but have been told all my blood tests are normal.

i have been referred to a neurosurgeon and neurologist  with ? A form of muscular dystrophy but now my muscle biopsy result has not shown the expected result. 

i struggle going up and down stairs often. I feel so fed up with my inability to do what I want to do as I have always been an active person. I have put weight on and cannot motivate myself to control my diet.