Thank you all for the replies and support!

Thank you especially, Knott, for all that information. From my MRI we discovered that my SI joint isn't fused properly, either a congenital thing (thanks, Mom and Dad!) or from repetitive stress in my misspent youth (funnyish aside: the orthopedist was questioning me to find out if I had done any activity that would involve repetitive back and forth movement around my waist. He says you see this a lot from people who played tennis and volleyball. I was all "no, nope, never done anything like that." It wasn't until I left the office that I remembered that I spent three years in college as a rower. Oops.) so I was primed for this sort of injury to begin with. I'm picturing my pelvis like a jigsaw puzzle that you can glue together to get it to stay permanently, but if the glue comes loose around individual pieces, it can make that piece pop out and weaken all the other ones around it. I don't know if this is accurate, but it's how I like to visualize what's going on.

From searching other threads I had found the "elephant ears" thing and had tried that to no effect. I'll give the cobra a try later today. The PT has me doing a couple of exercises that twist my pelvis as I do them, and that seems to provide immediate relief, but it doesn't last. I'm doing lots of planks (regular and side), pelvic tilts and bridges. Massage really helps, but what I need is for the PT to give my husband some instructions in how to do it right! It's hard for me to explain to DH what helps because I can't *see* what the PT is doing, and my attempts at explanation don't get the desired effect. I want to tell him to just get a meat mallet and whack the joint into place. Somehow I don't think that'll be too helpful, though.

Sarah