hello hopelesswife-
thank you for the update. i am relieved to hear you and your son are in a position of safety. well done.
upon reflection, i feel if i was walking a mile in your shoes, i would alert his family in the UK and also the doctor that prescribed the meds. your husband sounds delusional and incapable of making sane decisions.
i know it's hard, but your top priority is to keep yourself and that little boy safe. i would do what i could from a distance and then leave it in the hands of professionals trained to handle neurosis.
naive