My question involves criminal law for the state of: Maryland.
I went to a bar complex after a run wearing running tights. As I have some bladder control issues, I went to a bathroom stall to check things out. I bouncer shouted from the door to "you can't do that here!" and demanded I leave, another bouncer escorted me out. I went to another nearby bar in this complex to further check things out. As I was leaving the washroom, another bouncer aggressively grabbed my arm, twisted it behind me, and pushed me all the way out to the street where he detained me.
Other bouncers gathered and asked if I was a registered sex offender. I spoke to the bouncer who grabbed me to explain and all he muttered was things about the state's attorney's office and said I'd have to wait for the police. He demanded I show him my ID to which I foolishly relented and he took a photo of it. Now I feel really threatened and I pleaded with him, told him I have a government clearance, how this could ruin my life. All he said was "I'm just doing my job", expressed no sympathy and reminded me of a skinhead.
A police officer eventually came, the bouncer spoke to him, after a minute I was offered an opportunity to speak with him. Told the officer my side of the story, and he said "he didn't see anything himself" and said I could go. Next day I see a huge bruise on my arm where the bouncer grabbed me. I'm worried sick that they will press charges or refer my ID to the prosecutor's office. Meanwhile, I was the one assaulted and I have a picture of my arm to prove it.
What should I do? Should I call the bar to ask them to delete my ID and not do anything in exchange for me not pressing assault charges? Should I call the prosecutor's office? I'm worried that I will get a summons or a call... this could destroy my life! Any thoughts or advice is welcome!

