It's good to be aware but there is no point delaying when you are so much aware. See your dentist immediately and get your problem treated. It can be that the associated tooth is in a position to be saved by root canal treatment, otherwise if its too delayed, tooth has to be extracted and prosthetically rehabilitated.
Next Steps
See your dentist soon.
Health Tips
Do not sit with infection/ swelling in any part of your body. Visit a dentist/ doctor and get treated.