My husband is having rages he doesn't remember; recalls being angry/yelling, but blank on what he said/did, or why (unprovoked). he becomes very hostile and insulting, and sometimes throws, kicks or punches things. sudden onset. no physical issues?

You need to talk your husband into seeing a doctor, preferably a psychiatrist. If you have any concerns about your safety, it would be prudent to consult with your lawyer and contact the police.

Please see a Neurologist for a thorough examination to find out if there is a brain disorder. Have a complete physical examination to determine if there is an illness. If not, please see a Clinical Psychologist with expertise in multiple types of psychotherapy for help and if needed a Psychiatrist for medication.