This is really tough for you being caught in the middle of your husband and your son. If you would like some support for your self please contact us at Icarus Trust. We are a charity that supports people having to deal with the impact of addiction in their family, like yourself. If you contact us one of our Family Friends would speak with you and maybe that would help you to know what to do.
I agree with dodo, have you spoken to your son about the issues it’s resulting in for you?
Has he got any desire to sort himself out now you have already paid all his debts for him? Of course as his parent you are going to have his back but is he also going to help himself as it’s a shame it’s affecting your relationship.