Sorry to hear about your fall Pete and the injuries you sustained.
Yes, confidence is an important element, but I was wondering whether some light weight training might help. As someone who is erm...also definitely advancing in my own years, I'm aware that muscle tone, etc, can slacken off as we inexorably shuffle our way towards the door marked 'exit' (

) Weight training helps maintain our proprioception and general balance and, supposedly, helps us to catch ourselves, even unconsciously, before we list too far from the vertical and catch ourselves before we hit the dirt if we do stumble!
Have a speedy recovery.