as far as numbness goes, if I lean just right... say up against a railing I get tingles and numbness...
and you had mentioned that it just happened and you can't think of how... well it was the same with me... then I started to think way back and realized that a year or two prior to developing the standing pain... I was body slammed by a rather large friend.... and I remembered my back hurt for a while after that... remember... herniated disks don't just happen per-se.... they are degenerative and the cause could have occurred months or years ago....
the chiro did help to an extent, but PT and yoga helped MORE
everyone is different... and like a few of us have said... research and get as much info as you can