Walk over to your neighbor and ask if they can help you. You can arrange an Uber ride. Call friends and family.

Yes, it's very inconvenient, yet snow plows HAVE to get through. If you're disabled or elderly, it is expected that you have someone in your life for situations like this. I'm sorry there are no programs for you for these situations but they honestly don't happen that often. So you're getting the hard truth: ask for help.