R Zecharya Wallerstein gave an awesome shiur on gambling.. he spoke about how he was a major big time gambler as a young guy.. so much so that casinos would call him to come over and play. He speaks about how he stopped gambling and his struggle with it. Maybe it would be helpful to listen to his shiur about it (for yourself)? Or maybe it would be helpful to call him and speak to him about it and maybe he could speak to your husband.
Not sure how to contact him directly but to listen to his shiurim you can go to torahanytime.org and search by his name.
Good luck and I hope the situation improves.