Sitting on the bed just after having a bath, moved round & my back goes.
Managed after 30 mins to get up & sit in the computer chair that offers more back support.
Feel like i've been kicked in the back!!
In 1979 I picked up a heavy weight the wrong way (bent at the waist) and my back went, couldn't walk right for a month. Remember it well, it was an X-Ray set I picked up at the British Gas Depot on the Isle Of Grain.
In early '85 it came back to haunt me with a vengenance. Couldn't walk at all for four weeks, scared the hell out of me. Saw specialists everywhere, saw masseuses, got x-rayed, all sorts - nobody could find anything wrong
So yes, I know how painful that can be feckit. I've been alright since, touch wood