Why do I collapse then?

[pudding_bowl]

It can do. Most often people collapse because of a sharp pain rather than a loss of strength... but a significant prolapse that compressed the nerves could cause you to collapse. But thats quite a significant prolapse - the doctors would probably be looking to do surgery in that case.
It doesn't mean that it is though! There are hundreds of other reasons for collapse - talk to doctors re: blood tests etc to screen for other possible issues.

[crazycrow]

thanks -it doesnt hurt when it happens, other than landing on the floor(!) I am awaiting an MRI and surgery was mentioned, but hoping to find a miracle working physio in the midlands to avoid this!! cheers.