Wow! What you're describing is exactly what I have. I had terrible SPD with DS2 and since then my pelvis clunks right over my pubic bone. I squeeze my legs together to put it back in so it stops hurting. My hips hurt so bad, as does my back, still to this day. It is so bad that if I walk too far for too long, I break out in a pain induced sweat. It makes exercising very difficult right now. I'm hoping by losing the extra weight that I am carrying it will help the pain.