Billy, I had similar problems Feb. 16th. Had a stroke. I folded from standing and collapsed like a paper doll. Lucky I had Parachute Landing Fall training in the USAF.
The EMS guys said it was from a coronal right branch blockage. The CAT scan showed about 2" of carotid blocked just below ear level. Like you, I always thought I was strong and tough and could bull through anything. Not true anymore.
The EMS guys and Dr guessed that an artery had ruptured internally and caused sludge from the wall to be carried away by the bloodstream. AFAIK, no one verified that's what caused the blockage, so I'm not counting out a meteor strike to my neck or hostile space aliens. My guesses are just as good as theirs!

Got out of the Rehab Hospital March 5th, after much PT.
I'm walking 2 miles/day at a rapid pace, weather permitting. It seems to help getting my strength and memory back. I hope you will find a PT mode that helps with your recovery.
So, those V45S carbs I was going to ferry up to Canton won't be coming, after all. Best wishes.

Randy