You had a lucky escape considering you didn’t break anything, but its a shock when it happens. You did the right thing in not jumping straight back up after falling.
Are you able to do any exercises or join a walking group? I used to run an exercise group for people much older than yourself at a day hospital for the over 65’s in Hampstead. Some could only do chair exercises, whilst the others were more versatile. In the group, the ones who exercised regularly, rarely had a fracture during a fall. I am now 64 and it’s something I have to remind myself to do.... more exercise
Take care, hopefully your week ahead will improve.