What about a pillow under your knees as well?

I have to sleep with one between my legs but when I get really horrible hip/pelvis pain I put a thinnish one under my knees as well which helps to ease it.
Otherwise what about seeing an Osteo? I absolutely love mine and am in major need of an appt (have been slack in making an appt!) and always feel great once she's adjusted my pelvis & back!