I sympathize with your predicament. It is hard to accept that you may have to live your life as a SSI recipient and not be able to work in the field that you studied for. I am not in a position to give you advice on either situation. I just wanted to let you know that I will certainly keep you in my prayers and hope that you are able to find an answer that is both rewarding and accommodating to your health.
I have been very lucky in that I was able to start my own consulting business when I left my job (my doctors also thought that the stress of my job was contributing to the deterioration of my health). My luck was increased by the fact that my husband was gainfully employed and my little consulting income was not a factor in our lifestyle. I know that everyone is not in that position and that most people need to find a job that supports them. So, I am wishing you the best of luck and keeping you in my prayers hoping that you do, indeed, find a part-time job that does not aggravate your illness and that fulfills you and provides for your needs. I wish that I could do more.
Peace and Blessings