I think your pop has become loose and so it has started moving and due to this fracture is causing you pain. I would suggest you to go to your doctor and get this POP reapplied. This will help you in pain relief. I am having slight doubt why your doctor said that POP should be just for 7 days because no fracture heals so fast. So I think you are not having any fracture but just soft tissue injury and this is the reason that doctor has applied your POP. if you want to clarified about this then you can send this x rays to me.