When are you going to get your root canal done? I would let your dentist know and try to get in as soon as possible to get it taken care of before it worsens. Most likely the break in your tooth has exposed the tooth more bacteria and food buildup. This is resulting in irritation in the gums as well as possibly having bacteria buildup in your canals. The sooner you get it taken care of, the better as you'll prevent the bacteria from continuing to spread.