Vitamin B12 deficiency and Parkinsons together are not unknown.
Take a look at the NWPF link below.
If you are older, have a lot of numbness, especially in your legs, and feel unmotivated this could be you. There are a lot of symptoms that are neurological that come with B12 deficiency that you might think are PD symptoms. If in doubt get your B12 and folate levels checked out. If they are low show your doctor the link below...
http://www.nwpf.org/wellness/Physica...23&headerbar=4