My 44 year old male cousin was sitting in a meeting and suddenly experienced uncontrollable shaking in his hands and head; his face also became flushed and palms sweaty. I was not there but he said it was noticeable to everyone, and lasted for what seemed like forever, but he estimated about 20 minutes. He had no changes in diet, activity, is on no medications, etc. Any ideas what could cause this? Should he see a doctor or have gone to the ER?