I'm really not good at giving advice, but I thought that you can request alimony in a divorce, right? I don't think you need a lawyer for that... I could be wrong.
I'm sorry for the way people are treating you, including him. You just need support right now. I don't know why he is acting like that, but maybe he is just scared. But think about it, when you recover everything will be all better.
It sounds like you have a home, so it's more financial assistance..
You are considered separated as to getting assistance for some things the move out date of the spouse (in my state this is the law).
If you haven't, check out if you qualify for electric & phone assistance.
many hospitals also have programs that they do not advertise, for financial assistance/ same with the doctor's that are associated with them.
Aging agencies often have their resource books online with much information..
I think it's federal, the, homestead taxes, & food sales tax, for elderly/disabled (again maybe you could file right away & electronically).
As to filing for divorce, it's best to get an attorney however, if one has to, it is possible to do so, pro se.
You can get info online through the court website.
I think I have heard advice here that one might trying calling an attorney to see if they would be willing to take a case pro bono.
There's legal aid, but that usually still costs.
If you can? Maybe just try to get yourself grounded, then deal one step at a time with the divorce proceedings.. or at least get some counsel, even battered women's as he left you high & dry..
I will pray for you!
Hugs.