Parkinsonism can arise from undx'd and masked b12 deficiency.

Watch this video http://www.youtube.com/watch?v=BvEizypoyO0

and order these specific tests: serum b12, MMA and homocysteine [simple, cheap blood tests]. The strange sensations/pain, numbness, weakness and brain fog point to possible b12 deficiency, easy to rectify. If this is the cause, it will take prolonged but cheap treatment to reverse nerve damage.