If you're disabled, and a widow, have you applied for Social Security Disability? If you qualify by their deterimination, your children will also receive benefit check if they are under 18. You need to contact the Social Security Administration, and they can take your application over the phone. You may need to have a medical exam by one of their doctors, or if you have enough medical evidence with your own doctors, when they contact them, you may not need an exam.
You may qualify for Supplemental Security INcome also from the Social Security Administration, if you have a low income. Food stamps, and Medicaid.
If that guy hit you broadside -- why don't you sue him? Atleast you might get money for another car. I'd contact an attorney -- most of them that handle accidents, will work for free, and only get paid if you get an award from the court. check your phone booksand start calling.