Nerve damage after filler - wait or dissolve asap?

Great question! The brows and forehead are advanced areas for filler correction, and it sounds like you worked with a very expert dermatologist.  The first and most important thing would be to have your injector re-evaluate the area for any signs of concern, like changes in color of the skin like duskiness, especially to make sure there is no issue with good circulation in the area.   Symptoms of persistent pain and burning that is more than expected with a bruise sometimes show vessel related issues, and may not be nerve related.  However, it is not unusual if the cannula nudged up against a nerve during your procedure, you can feel some radiating discomfort at the time of the procedure.  It is important you have this area re-evaluated by your dermatologist as soon as possible.