Hi Vickie!
Welcome to NeuroTalk!
You may want to look into whether you have accumulated any earned income credits within the Social Security system. If you have ever worked on the books, you would have been making contributions.
What you are calling SSI, I think, you mean social security disability coverage. In my state, "SSI" is a state-level Supplemental Security Income which is a monthly cash allowance which, I think, is meant to be temporary.
If your doctor has indicated that you are disabled and has documented this, there are many programs to assist you, but most will be on the state or county level.
You might find some tips in our Social Security forum here:
http://neurotalk.psychcentral.com/forum28.html