I had a very similar thing happen to me in the late 80’s when I was 5. I remember getting out of bed and falling to the ground as I couldn’t feel my legs. I lost function of both legs and couldn’t walk, my parents brought me into doctors and specialist and they had no answers. Less than a week later I regained feeling and function of both my legs like nothing ever happened. I don’t recall having a fever.

I actually forgot that happened to me until your story just now. Crazy.