Need financial assistance

Hello, I am Timothy A. Brown, I prefer being called Tim.
I am a fulltime student on a very limited low income, because I am also the sole caretaker for my elderly parents who both have serious health problems, and in my efforts to help them with their financial and health problems, I now have financial problems. I myself am disabled because of serious heart problems that with a congenital heart defect that I was born with an aorta heart valve that had only two leaflets, and I have been very ill for the past four years because the aorta valve defect had become very severe, which resulted in one major heart attack and several silent heart attacks that my cardiologist diagnosed about three years by performing an angioplasty. last year in 2005 my heart surgeon performed open heart surgery to replace the severely damaged aorta valve because of severe aortic regurgitation and stenosis. So my heart valve was replaced with a mechanical heart valve. However, I am on a long course of health recovery that still results in my being disabled, and trying to finish my college education through Northern Arizona University through their internet classes and being the sole caretaker for my parents who live on a very low income and are having serious financial difficulties, and I also receive a very low monthly income of social security supplemental benefits that I have used solely to help my parents financially. However, I have been having serious financial problems myself trying to help my parents by myself, and my sister and her husband are unable to help me and friends are unable to help us.
My father has had a severe stroke that resulted in most of his brain damage from severe bleeding insideof his skull, and he has been declining a great deal because of the stroke damage. My mother has her own serious health issues that have resulted in her becoming physically disabled.
I lot has happened to my mother, father, and myself that has caused us to have financial problems that have become serious, and threaten the health and wellbeing of my parents and myself.
I have never asked for any help from others because I have always been responsible to take care of living expenses for myself and my parents. But I am "backed-up against a wall" unable to find any help and I along with my parents very low income are not able to work this on my own because I have been their sole provider and caretaker for over five years.
So I am asking for any kind of help and assistance that anyone can provide. I have always been generous to help others anyway that I could in the past, and I continue to help others through moral support, and I do my best to freely volunteer to help family, friends and others, even though I cannot do much physically to help them.
If anyone can help us, it will be greatly appreciated!
I really will appeciate your assistance during this time of crisis!
Thank You for yor understanding, Tim Brown.
My mailing address is: Tim Brown, P.O. Box 892, Dewey Arizona 86327.