I would think that would be an indication to get in touch with a doctor ASAP. Even if there are neurologists looking at this post, without knowing the details of your "severe brain damage," any advice would be guesswork. Given your history and especially your fear of what the numbness may mean, talk to a physician to hopefully be assured that it's nothing (or be advised otherwise).
DX: New Daily Persistant Headache (Jan. 2003), Bipolar 2, Recovered CRPS
RX: Zonegran, Lamictal, Minocyclin, Abilify, Cymbalta, Wellbutrin, Provigil, Clonazepam, Rozerem
PRN: DHE IM, Droperidol IM, Toradol IM, Haloperidol, Zyprexa, Thorazine, Zofran