Should i see a doctor or not?

last thursday i was diagnosed with bronchitis and put on antibiotics.... on sunday my lower back started to hurt whenever i coughed. like a stabbing pain. now it hurts whenever i move suddenly or when i run or swim. this is verrrrrrry bad because i have a swim meet in a few hours. should i go see a doctor or do you think i should just wait and see if it goes away? and is there anything i can do now to make it hurt less for my swim meet?