Yes, likely a citizen arrest situation since the officer didn't witness the fight. You both make a complaint against each other, you both go to jail, and in the end nothing happens in court because it was mutual combat.
It doesn't matter that you were hit first. If you hit back you opened the door to becoming a suspect and being arrested.
Hitting back is not always self defense. More often than not it is retaliation that is excessive compared to the level of violence that initiated everything.