Higher b12 levels indicates serious liver or kidney dysfunction or cancer, visit your nearest physician and oncologist both.

Firstly don't feel panic!! This is not serious but u should consult your general physician take vitamin D supplements that is necessary at this point of time, secondly start doing simple exercises especially outdoor may be simple walking or cycling which helps your muscle and bone strong and movements helps to improve your blood circulation and muscle to pump, absorption of vit D into your bones!! Hope this will be of useful at this point of now!!