Looking for advice and support!!

I am 28 years old, currently 14 weeks pregnant and already planning on having this baby alone.

We dated for over 2 years, were TTC and I was pregnant before we got married. Neither one of us cared a whole lot about getting married, but when he looked into the health insurance benefits and how much money it would save us, he suggested it and I went agreed. We were married in late May...

The first 2 weeks of marriage were fine, but then the last 2-3 weeks were a nightmare. He shut down emotionally and it seemed like nothing I did was good enough for him. Every day I felt like such a disappointment. Finally, one day I asked him if we could spend some time together- go to dinner and a movie- he reluctantly agreed but one thing led to another and before I knew it, we were fighting. He said some horrible things to me- told me to keep the baby because he wasn't going to share it with any future significant others that either of us have. He told me he would rather have kids with someone he loved and cared about. It broke my heart.

As days passed, he continued to send me text messages. One minute he says he's sorry, begging me to come home and the next minute he hates me again and says he can never forgive me. There are so many other things that worry and concern me, but despite all of this, I really just want him to get some help. I think he has some sort of mental illness- dissociative identity disorder, OCD, bipolar?

Has anyone else had experience dealing with a loved one with mental illness? How do you cope? How can you help them? And what should I do now? I'm back at home with my mom, and trying my best to focus on the health and future for both myself and this baby. Any advice, support, or even just kind words would be so appreciated right now.