Are you ready to stop? you can do it it sounds like you are already tapering .It does not sounds like your home life is very healthy at the moment and that is not good for you or your baby .We will be here to support you .Hang in there .
Popping an extra pill won't do anything except throw you off track and make your state of mind even worse because then you'll end up feeling guilty about it.
You need to get into some aftercare right away. Find some NA meetings and start going. You'll meet people there who can really help you and it's a must to have aftercare if you really want to succeed at recovery. And finding a therapist to work one on one with you is important too. You have a lot on your plate - a new baby, an addiction your trying to deal with and a partner who sounds very unsupportive to say the least. See of he is willing to get some marital counselling with you. You have to work through all these issues a step at a time. I'm sure your feeling overwhelmed and anxious right now. For the sake of yourself and your baby, please get some help. Although your little one is only 4 months old, the baby is picking up on all the negativity in the household and that is affecting him for sure. It sounds like you really need some support so please get to some meetings, get into therapy and even if he won't go, you need to. I hope you both can work on your marraige to make it a happy one but in the end you have to make decisions to better the lives of yourself and your child. Any couple with a new baby struggles with the pressures of parenthood but because there are many other issues on top of that, getting help asap is very very important right now. Please keep posting, the people here are amazing support and we will help you as much as we can but you need to do the legwork and follow up on getting the help you desperately need right now. Give yourself the credit you deserve for working hard to make a better future for you and your child.