Tooth Nerve Pain, Help?

For four days I have had pain on one of my teeth, my dentist said I have Root Canal. To make problems worse I have a bridge over the affected tooth. Sadly, I can not pay for the root canal. So I need some help on how to reduce the pain of my tooth. I have been taking antibiotics to hopefully stop the infection & pain killers to stop the pain. Is there anything else I should do?.