I NEED TO STOP THE VOICES?

Around two weeks ago i went on a field trip to Highland maximum securiy prison. I suppose they were trying to scare us into not commiting crime. I kind of got left behind from the pack... guess that's an exageration, i could still see my cl. I was walking along one of the corridors when a man slammed himself into the bars and began to yell at me. It was the scariest thing i have ever experienced. He began to mutter things i couldn;t understand, possibly mexican coz that's what he looked like. I couldn't take my eyes away, he stared at me and gave one last scream and then backed away. Since that day i've been hearing that muttering in my head everyday, at 2:oo pm, the same time i visited the prison. The voices are becoming clearer. I;m truly scared, am i going crazy. I swear i heard the word death. What should i do.