I know exactly how you feel.

I recently had my son 7 weeks ago via c section and I had the hip pain and pelvis pain(spd). The best relief for me was the pool as gravity naturally took the pressure off my hips. I found the days that i went to the pool, the better my sleep was that evening. There was no swimming though, it was purely just hanging onto a kickboard and floating (helped me too with my swelling).

What ever you decide, try not to let it go untreated. 7 weeks post my baby being born I am still having a lot of pain.

Ohh and more support under my bump rather than the pillow between my legs seemed to help a little too. Good luck