Librium is a benzo. Benzos are used in detox facilities to help with withdrawal and yes they do have anti seizure actions.
If it were me, I would put the responsibility of a safe medical, or an at home dangerous detox squarely in the hands of your husband. Bottom line, it's dangerous, after three trips to the er , and three attempts, I'm not sure why there is any question around doing a safe medically supervised detox.
I naively let him dry out last time without a full understanding what would happen.
This statement confuses me, you let him??? My guess is he is an adult, he made that decision on his own. You do not own any responsibility in this, it's his deal.