I'm so glad that you didn't seriously injure yourself, Bobby! It must have been really scary when you couldn't get up off the floor! (((HUGS)))

You can go back over your posts if you want, but it's clear to me from reading about your falls, I see a clear pattern...
They happen after you overexert yourself/overdo it

I'm concerned that you may be having a hard time recognizing your own limits, and may not be listening hard enough to what your body is telling you.
What did your body feel like WHILE you were walking those 3 blocks AND BACK?

I know that you want to be more active, but I think that sometimes you are pushing yourself too hard, too fast. I think slow and steady is probably the best plan

I realize that is the pot calling the kettle black...