I am the mom of a compulsive gambler. It is a very manipulative, insidious addiction that can completely destroy a family both financially and emotionally before you know what is going on.
My advice would be to gain TOTAL control of the finances. I know it feels like you are dealing with a child but you really need to take away any access your husband has to money.
I kind of feel that as for the relationship you should put off doing anything about that until the dust settles. I say this only as it sounds virtually impossible for you to support yourself at the momen and with your husband in the state he is in he won’t be of much help on his own. If he refuses to cooperate in letting you take control then I guess you will have to take action sooner than later.
You are in an awful situation and must feel totally trapped… I am so sorry.
Keep writing and perhaps join the F&F chat on Tuesday. You will be able to get more insight from the other spouses!