Hi, kathrynw. If you are having trouble opening cans, I'm sure you're having trouble grasping other objects. If MG is so bad that the hands are bad, then you may want to talk to your neuro!
I'm sorry you aren't having much support. Perhaps your family doesn't understand MG. There is a lot of info on the Internet about it.
Home for example is a great site.
What else can we do to help?
Annie