My spd is so bad I'm having a csection on Monday at 38+4, I've been on crutches for about 12weeks and in a wheelchair when out and about for a couple of months!
The best advice I can give you is to use a heat pack or ice pack as that eases the pain, warm baths, sleep on a folded duvet/blanket to make things more comfy and try and keep your movements even so that you don't twist your pelvis too much because that aggreivates things. Rest as much as you can but change position fregularly so that you don't get too stiff.
Hope little ones don't keep you waiting too long