I'm 32wks with twins and unfortunately since around 19wks, I've never had a whole unbroken nights sleep.
Similar reasons to you initially, hips absolutely killed, but not in an SPD way, this was true, in the joint pain from being on my side. Also little ones loved to wake up during the night and thought it a perfect opportunity to have a fight between themselves!
Nothing I could do about the active twins, now they're running out of space so that's easing off luckily!
As for the hips, what I found worked to give me at least a few extra hours sleep was a duvet folded over a few times (at least 4 layers minimum, more the better) placed underneath me from my shoulders down to mid thigh. Make sure any padding under your hips also extends to your shoulders - I made the error of just putting padding under my hips and after a week got horrendous rib and shoulder pain from the transferred pressure which took another week to settle! Also put a pillow between your thighs to keep your top hip in a neutral position, as well as a pillow between your calves so your upper leg is straight and not in a 'frog position'.
That's helped me out massively. Still can't get through a whole night but at least I have around 5 hours unbroken sleep and just turn to the opposite side (after a toilet trip! This again helps to stretch my hips and relax them) for the remainder of the night.
Another thing I do after a particularly active day when my hips are at their worst is have a really, really squishy pillow, (or a huge fluffy jumper when I'm away) and lie slightly turned onto my front having a big hug with the squishy thing underneath my chest to make sure bump has room. I keep my bottom leg straight-ish and moved slightly backwards so I can get my weight completely off my hip joint itself, it's more the front wing of my pelvis in contact with the bed and I have my upper leg bent up for support. Again I pop a pill between my thicghs for more support. Not sure if that makes sense?! But I'm still doing that even with a 32wk twin bump.
I went to GP's too, had a physio appointment but all I was given was a hip support for during the day (the time when my hips didn't hurt!) and a few exercises which were relaxing, but didn't particularly help. Hopefully you get on a little better :)