Hi Hannah B

I'm sorry to hear about your situation. I can sense you are in a delicate emotional state yourself, this can very very hard on the family, and we often lose hope. That doesn't mean there isn't.
Having a kid makes it harder, I have 2. Just because there are more variables, and the dynamics multiply. But also, anything you do good for one in the family, it extends to the rest. Anything you do for yourself, makes an impact in your couple, and the family, anything you do for her or him, it will be algo good for yourself.
So, 1st you need to find a way to bring your emotions down, so you can think and express yourself more clearly in the relationship. One way is talking here, and knowing someone understands you, and roots for your success.
Then step by step, with patience, you go learning things you need to stop doing, and new things you can do instead, that make things easier.
The book can be a lot to take in. But here you have some lessons and basic tools that are small pills of experience. Also, there are a lot of good people here, and all of us have gone/is going through similar situations. I've got some great advice and a lot of support from the people here. You are not alone.
Wish you the best!