Sorry to hear about your problem. I was married with a man like that and these is what I did. I started working because I felt insecure about my future with a man like that and, sorry to tell you but gamblers are very likely to be drug adicts as well. Drugs run a lot in places for gamblers. I don´t want to sound rude but when you stop worring about him and start worring about you and take some action that will make you feel beter and incharge of your life. I know it sounds scary and it is difficult, but be brave. Take your life in your hands. I got stronger and left my husband. It took time and effort but I don´t regret that.
Wishing to help.