It is always an adjustment when a new member is added to the family. I know it's not easy carrying the majority of the load on your shoulders especially when your spouse has set rules regarding when and how you two can or cannot converse. You mentioned how kind, patient and understanding your husband was with your struggles, did something happen to change that? I don't think he's looking at things with a clear mind. To me, he has a perfect opportunity to de-stress the home by spending time with his wife and son that he has not seen all day.
Keep in mind that you are worthy of dignity and respect. Never let anyone make you feel otherwise. When and if you can, take your son for walks or to the local park. Young mothers, such as yourself, do the same and chances are good that you'll make some new friends. Keep your thoughts positive and the likes of that will prosper.