I also have symphysis pubis (pretty name, hey?). Physio said the single worst thing you can do is walking - or any activity that involves balancing on one foot at a time. mine has really settled down since I started being careful about what I do, keeping legs together as I get in and out of car, wearing a support belt and using an ice pack regularly. She gave me exercises (more like activities, since they're not remotely strenuous) that involve sitting on a fitball and 'retraining' my pelvis and ab muscles. Physios are great for these kinds of problems if you can afford it.