I am so sorry to hear about your entire situation, I think it is amazing that you are handling all this with everything that is going on. I know I would not be that strong.
A question I have is even if you could afford a lawyer and get a divorce it doesn't sound like you H is in a financial position to help you in what you are facing, or is that wrong? Reason I ask is it would be more burden to get things sorted only to have him financially unable to provide support or insurance.
