Girls, I don't know what to do anymore, awful pain in my left side (cl…

Girls, I don't know what to do anymore, awful pain in my left side (closer to the pubic area) for 4 months now, all signs of sciatica, but an ultrasound of my spine is normal. I can't lift my leg, I can't turn over on my other side when lying down, I walk poorly. The pain is shooting, sharp, and with a crack! It feels like something got jammed and I can't figure out where. Either the pelvis, or the clavicle bone or even the spine, but it hurts there ? The doctor says that it's ligaments that stretch (but I find it hard to believe that ligaments crack), When we did an ultrasound of my spine at