work environment harassment

I am having trouble with my co-workers. Recently, I was allowed to go home early. My manager made the decision. The following day when I returned to work my work vehicle was filled with office equipment and something was poured on the seat of my vehicle. My manager states that he is going to write this individual up for harassment however, the tension in the work environment has caused me a great deal of emotional distress. It seems as though through a series of events leading up to this I have been the target of harassment for several months. I believe that these acts are do to my sexuality. I do not want to file anything against my manager. I was wondering what kinds of action,(if any), could be taken towards my fellow employees? I am particularly interested in the incident which lead to the sabotage of my work vehicle. Should I let the situation go? I recently have sought counseling through my employer. I am afraid that the situation could intensify and I am constantly worried about what will happen next. Do you think that I could be over-reacting? What should or could I do. Thank you for your time.

Sincerely,
Diane Stark