My first thoughts are of course about how hard it is to be a single mom in these times. Without having a job and a stable income you have a good chance of losing custody to him. Then also having to pay him child support and spousal support. It has been happening more and more and more.
BUT in this instance I truly believe than he is unstable and that he may find himself with a mental health diagnosis if he ever submitted to an evaluation for mental health issues.
Sweetie, you need to go to a shelter today. You need to pick up your child and just leave. They should have a clothing room and some diapers you can use until you can get some state assistance coming in. You can't work right now so that is what you'll have to depend on until you have the baby and are released by the doc to find work. Plus if you breast feed this little one you'll have to be figuring out how to do that while working full time once you get a job. Lots of mom's figure this out so I know you can do it too.
If you don't have an education that you can fall back on I suggest you consider applying for financial aid right now for the coming spring semester. You may not get anything but you can apply for Summer or even next fall as soon as income tax papers have come in. If you have filed for divorce by the end of the year you might be able to get your taxes done without him, it will be your own income with the 2 kids. Then you can get full financial aid to go to school full time.
If you go to a full university they will have married/family housing and it will be more affordable than any other housing you can have. You may also have housing assistance to pay all or part of your rent. This will make life much easier. My rent at OSU in Stillwater was $43 per month. Yes, I had housing assistance. The regular rent, bills paid with phone and cable included was under $500 per month for everyone else.
I truly believe that women must have an education to get the better paying jobs so they can become independent.
If he wasn't treating you so badly, like denying you and his unborn child medical care then perhaps working it out could be something that would work but that action speaks as loud as anything. LISTEN TO WHAT IT SAID. He does not love you nor does he love this unborn child. He would rather you walked to the hospital than help you. This tells you he does not love or want you. Take care of this yourself. Go find someplace else to stay until you can get on your feet financially and get an education.