I feel your pain.

You should get some physio, avoid things that put uneven pressure on your pelvis (like standing on one leg, pushing something with one foot, etc) and don't be afraid of heat packs and the like.

I swear, SPD made me the most miserable I have ever been at the end of last pregnancy and I am so dreading it this time around. And I find that after pregnancy it takes months before everything feels like it is sitting together properly.