I am sorry to hear about your job loss. You are going through a very hard time but do not be too hard on yourself. There are other jobs out there which I am sure you have the qualifications for. When you have a chance, get out your resume and go to your local unemployment office and see if they can provide you some assistance in updating and polishing it up.
I can only imagine how hard it must be to have a parent disabled from the time of your birth. I am sure it has made it somewhat difficult for you throughout your life. Are there any support groups in your area for care-giving?
Meanwhile, take a deep breath and know that we are here for you. If you were to think about yourself, I bet you would find that you have many exceptional qualities that you can add to your resume. Do not be afraid - you are an amazing person, a warm and wonderful daughter! Hang in there, dear heart...