I am currently preggo with baby number two, my first pregnancy was amazing..couldn't have been easier, no so much this time around. When I was around twenty two weeks my baby firmly planted itself on my siatic nerve resulting in temporary paralysis...which came on frighteningly quickly (once while I was driving and it was my right leg that was paralyzed). My doctor much like yours recommended excercises, sitting on my hands and knees, putting my chest on the floor and hips elevated..did not do a thing. I just got use to walking like the hunch back (if I was able to walk at all). I have always fixed my own cars but since i was pregnant and my exhaust needed changed my boyf galantly offered to do it for me, after a week and a half of procrastination on his part and a whole lot of too stubborn for my own good on mine I did it myself fully expecting to be in unimaginably pain the following day..guess what I have not felt it since that cold cement no pain...so if all else fails try that, good luck