I had symphasis pubis dysfunction during this PG and also general pain in the other pelvic joints. I saw a physio for it and attended pilates which helped a great deal to manage the pain for me most of the time.
I didn't use a brace. Cailin did so I'll ask her to come in and tell you about what helped for her.

I found that doing pilates helped as strong pelvic floor muscles will support the joints. Also keeping your pelvis balanced at all times can help. The worst pain was when I stood on one foot like up and down stairs and if I got up from the floor in a kneeling position. Getting in and out of the car is also a killer. Put your bum on the seat first and then swing your legs over together. When you sleep you can use a pillow between your knees and when you roll over think about it first, breathe out, brace your pelvic floor and roll over in one smooth motion. It seems like a lot to think about when you're half asleep but it's better that the stabbing jolt of pain that comes if I didn't.

Make your movements slow and deliberate. Think about how you'll do something rather than going gung ho.

Give up the vaccuum! I did as it was a major trigger for me having a melt down. DH ended up being the vaccuum driver in my household as he quickly learnt that if I did it I would be in a gony for days afterward.

I do still have problem now from it so going to a physio to learn some good management strategies could be a benefit to you.