Have you ever been "hazed" at work? Advice needed PLEASE?

I am the target of a smear campaign. A woman lied and said I had an obsession with a male coworker. I didn't--the woman who spread the rumor was the one obsessed (an I can prove it), its my opinion she got mad because I said hello to him. Her rumor resulted in an inappropriate joke (getting the coworker to act like he was interested in me, I guess to gauge my reaction--the more i seemed disinterested the more went out of his way to make me think he was interested). My every move and utterance were being scrutinized by every single person there, and I was the only one there who didn't "know" I had an obsession for him. Last week an innocent action I took off-site has resulted in coworkers spreading lies about my personal life, saying this openly in front of me, even saying I need to find another employer.