Here's a helpful link:
http://www.ninds.nih.gov/disorders/chorea/chorea.htm
It should be noted that this can be casued by levodopa. Chorea is often closely associated with Huntington's - I pray you do not have that form!
There is also some good into in this site....
http://endoflifecare.tripod.com/juve...ease/id61.html
.