Hi. I am sorry about what you are going through in life. From what you have mentioned, it seems you are really having a difficult time. You and your husband really need to make efforts to make your marriage work, for yourselves as well as your son. The best way forward will be to seek professional help in form of couples therapy. It would include sessions working on trying to improve the relationship.
Next Steps
Seek a psychiatrist or psychologist and plan couples therapy sessions.
Health Tips
It's never too late to start afresh. All to your husband about seeking therapy. It will be important for your and your son's happiness.