I am sorry to hear of your encounter. I believe we so easily feel threatened by others because our lives were betrayed so young. Trust and having the feeling of being respected is so easily lost. Try to relax and realize it was only an incident and not what happened with the abuse. Rage can alter how we perceive ourselves and others.
Do something you enjoy, take a walk and venting always helps as long as it does not consumer you. Think of three things that made you happy yesterday or over the past week.
It takes time and you are facing it and realizing how you feel. Important steps.