Know the feeling, Pumpkin. I had horrible pain from SPD from about 14 weeks, it's like everything just...gave out! Now my hips just ache all night (I'm almost 24 wks); I find it worse when bubby's head is engaged. I've been told not to sleep on my back and sleeping on my side just hurts so much. Osteo and swimming pools and specialists just aren't an option for me because I live about 8 hours from capital city, but a pillow between the knees and under the bump has helped a bit, as well as a support belt for short periods of time. It's definitely worse when I've been sitting in one position for a long time (like in the car) so getting up and moving about helps, maintaining a correct posture, etc, helps, too.

Good luck, I hope it gets better soon!