I had this with DS1. Partly it was SPD. I found the only way I could sleep was by rotation. I had a number of pillows under belly, knees, etc. i would sleep on my left, get up to pee, rearrange pillows, sleep on my right, get up to pee, rearrange pillows, sleep on my back, then repeat. To sleep on my back, I bought a big wedge pillow to prop me up. We have a Tempur mattress, which is lovely, but it didn't stop the pain.

In addition, I went to the osteo, physio, acupuncture and hydrotherapy. The only time I had relief from pain was during hydrotherapy. I ended up finishing work at 32 weeks, though most of this was related to SPD.