It could be a pinched sciatic nerve. If so, do this for instant relief.
Lay on your back on a firm surface (hard wood floors are perfect)
Stretch out (like everyone else mentioned)
now most importantly:
get a large, thick towel and roll it up
place it underneath your pelvis area
so that it lifts your lower body higher
What this does is it relieves the pressure from
you spine. If it IS a pinched sciatic nerve,
that means that the vertebrae on your spine are
pinching down on the nerve like a vice grip
doing this instantly relieves the pressure
try it out i a room with a tv, or something entertaining
basically, give it some time (5-10 min)
I hope this helps you
EDIT: wait, this thread is from July?