Posts like this make me so happy to be Canadian. Our system is far from perfect, but the idea of not being able to survive due to medical problems is just so alien to me.
I am so sorry you have to go through this stress on top of your medical issues. How long ago were you diagnosed? It sounds like your parents are having a hard time coming to terms with the diagnosis. When I first found out, my father pushed me a lot. He feared I would just give up and use the MS as a crutch of life excuse. It took time and a major relapse to scare him into realizing that this is an extremely difficult, serious disease.
I hope that your parents come around eventually. How involved are they in your medical care?
I am not from your country so I don't have any advice insurance-wise, but maybe you can try calling your state's MS Society? They would know the best channels to getting you on your feet again.