As people age; their are two things which occur. They either retire with a pension and social security to live on or they are already (which is most likely with people who have a disability) recieving disability benefits of some sort as income for this reason.
The divorce should entitle you to all benefits that were instill during the time you were married, with the exception of income unless their is a spousal agreement in place (most divorce attorney's do provide). Yet, their are outstanding laws that protect the rights of individuals who have a disability and they are to honored. I would seek the advice of a disability attorney. You future and the future of your family just doesn't end the responsiblity. Therefore look for income resources that you might be able to pursue verses depending upon old relationship which continue to be a deterent to your life.