Pain in gums..can't brush my teeth?

i'm not a one who brush my teeth everyday, last monday i went to the dentist cause i had a gingivitis, he gave me cariax toothpaste and mouthwash and told me to brush twice a day.. and fixed an appointment for two weeks to clean (if needed) and fillings..the problem is that i brushed really hard and now my gums are really sore, especially on one side, i even have pus. what should i do??? will it pass by itself ?