People often say if a breast lump hurts it isn't cancer but we both know that isn't true. It may well be just an inflammed node but I wouldn't think this would be usual after a fall. Maybe it is damage to the area of your lymph treatment after the fall. A mammogram won't show this. I think really you need an ultrasound to check it out. You could wait a week and do it if not settled...that is up to you. But if not sleeping...well....you know what you have to do...and we all get it, fed up with Drs and the process. Take care. Kath x