Sounds a horribly difficult decision fennel. I wouldn’t want to put you at risk but I’m wondering if there was a reason you fell. Was there an uneven paving stone, a high kerb, something lying in the floor? Anything unusual?
I’m sorry if this sounds like prying but is there a physical reason? Have you been checked out by a doctor since you began to fall?
It’s just that I’m thinking after an accident is not a good time to be making decisions. I guess keeping your independence can happen in many ways, certainly being in one piece is a start. I think if it were me I’d seek medical advice then make a decision about walking alone after dark. I might think it best to use a stick or perhaps two, consider a taxi or even travel with a friend if that were possible.
Hope the knee mends very soon and wishing you well. I really hope you can keep doing what you want to do, even if you need to adapt the way you do it.