Sweetie you need to stop the bellydancing asap - too many of the movements put asymmetrical stress on the pelvis, which will exacerbate the stretching. Moves that you can still do (provided they're not causing pain) include any of upper body isolations (ie your rib, shoulder and arm movements) and those pelvic lifts where the pelvis moves back and forwards (we call it a pelvic tilt) but nothing side to side which rules out all the circles and hip lift/drop/shimmies (ie the bulk of bellydancing). The physio will be able to advise you further re other activities, but I found even basic-non-exercise walking was too much, and had to organise my days around taking as few steps as possible...anything that twists or places strain on the pelvis needs to be avoided, this includes stairs, walking up hills, carrying things, even pushing shopping trolleys. This is one condition where you should not try to "push through" the pain, it can get much much worse and you dont' want to land yourself in a walking frame or wheelchair just because you pushed earlier when you shouldn't have. Sounds scary, but it can be managed and it's helpful to remember that it's only temporary.