One bad decision has repeatedly bit me in the ass

When my husband and I first started dating, he didn't have a job and was going to school full time. He didn't have a job for the first two years of our relationship. His car burned out shortly after starting his first trucking job so as a sacrifice for his job I convinced my brother to sell him a car that was supposed to be given to me to get back and forth from college and my job. In return my then boyfriend bought the car, and sold it a week later. I was so mad that I was going to break up with him. He surprised me a week later with a proposal that was kind of a disappointment in every way but it reminded me why I loved him so much. ANYWAYS he bought a fucking overpriced two door convertible 2003 mustang a day before proposing to me, and didn't tell me about it. This car. This fucking car. We put hundreds on top of hundreds into it just to keep it running. We got married three months later and tried to get it traded in but it just wasn't possible. Hundreds come, hundreds go into the car, two trucking jobs and two moves later I became pregnant. Tried to get it traded in, just wasn't happening. We bought a second car which was pretty good but we decided to move to FL and we had to leave it behind. So the stang made it to Florida but that was it. The job that hubby had lined up fell through. Stang gives out, 300$ out of the savings goes with it. Had the baby, he gets a shitty job, but her car seat doesn't fit in the back of the car so we've been completely dependent off my mom. Finally the entire muffler is about to fall out, alternator is about to blow, it's time to register the car and we don't have the 3000$ to invest so we go to a dealership to trade it in. They fucked us in such a way that they ended up stealing the mustang from us (they paid the loan, and added it to the new one but put no money towards the new one, they said they'd put 2500 in). and they raised the amount we agreed AND SIGNED that we could pay a month by 130$ AND MY FUCKING HUSBAND SIGNED THE FUCKING PAPERS SO THERE IS NO COMING BACK FROM IT. here we are. THINGS WERE ALREADY TIGHT AND NOW I CANT SLEEP THINKING ABOUT HOW IM SUPPOSED TO COME UP WITH 200$ EXTRA A MONTH INCLUDING HIGHER INSURANCE COSTS. and I'm so so so stressed out. I'm already exclusively breastfeeding, cloth diapering with old school cloths the whole nine. we are so broke. I can't go to work because my parents are too sick to watch the baby. this whole thing just has me crying day and night. And he says to me "baby I'm gonna make it right, don't you trust me?" NO. I DONT. I'm dying. I guess I'll just have to stop eating.