Question

I am 21 and i go to wesley college cops came to the party and so we were leaving as we walk out the front there was a boy thrown to the ground yelling "im not resisting" "what did i do" the cops smashed his head into the concrete and began to tazer him for no reason, the police officer asked us to leave so my boyfriend and I was walking across the street when out of no where a police officer pushed me and slamed me into the back of a cop car. I am 5/3 115 pounds and the officer was 6/3 at least 250 pounds i was no threat to him there was at least 20 witnesses that saw he out of no where pushed me and threw me into the cop car. After i was arrested and put in the back of the cop car.... another officer gets it and says " why is miss giggles in my car?" The other cop said "I dont know just give her something, dont let her walk away with nothing!" I got a disorderly conduct can i fight it?