Re: pinching nerve in the behing.
I just posted on another thread about this...if you've already had an MRI and the results were negative, it may be Piriformis Syndrome.
Usually that's caused by the Piriformis, which runs out to the hip bone and under the glutes, and usually affects the L3-4 or L4-5 area. However, that usually means that your numbness would mainly affect the outside of your thigh and calf, not the inside. The inside of your thigh and calf are affected by L1-3.
I use the following to provide relief: 1) lie on back and pull problem leg (straight) across the body using a sash or similar item, 2) lie on stomach and tuck 1 leg under the body (knee around the sternum), and 3) lie on back and tuck 1 tennis ball under the middle of each buttock and adjust until you feel the pressure.
Hope this helps, and please keep us posted.
Sciatica, L3-4 Tear, Spinal Stenosis, DDD L3-S1
Fusion (BMP) L4-5 '11
Anterior Fusion (BMP) L3-S1 '13