Day Lily Day Reprise

Woke today with a pain in my back.
Tried walking it off by going to the Garage and back but no good. Had a lie down for an hour but still not good. Walked up the garden and then I got spasms and the old sensation of jelly like legs,.making me very wobbly and almost falling. Back to bed for 2 hours but still no good.
We're due at the gym at the hospital tomorrow to try some different exercises - if we go I won't be driving....
Feeling fed up but it might just be a blip so to speak - fingers crossed.
At the moment I feel as tho I'm back at square one...
Very very hot day