Symptoms may indicate grand-mal seizures

DEAR DR. GOTT: I am writing about someone I know. He is 40 years old and has had the following symptoms for at least the past 10 years: fits of rage, seizure-like episodes (unconscious, body goes rigid, convulses, wets self, confusion, weakness and vomiting), hand tremors, neck and shoulder pain, and self-confessed fainting spells (although these may have been seizures). Two times following seizures, tests gave no indication of having had a seizure.

Do you have any suggestions about what this may be?
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