former employer getting scary

I hope you dont mind.
I have a question/problem...
I was permanently laid-off by my employer om 3/1 She told me her husband wanted her to do the bkpg and didnt want to hire me in the first place. She had told me that when I was hired in Sept. Before me they had a bkpr and have many charges against her for embezzelment and unauthorized use. When I came to the company I 'befriended' the owner. She told me that some of the charges against the other woman were false. I reported my findings in the company's books to the police officer handling the case. When I was let go or permanently laid-off as the owner put it...she had me sign a paer saying that I would get my last check and reimbursement for the receipts I turned in as well as continued healthcare until I got another job. In exchange I said I wouldnt sue her. But I did qualify for unemployment.
Since then I have received neither my last paycheck, my expense reimbursement, my severance pay, and my health insurance has been cancelled. I got a letter from unemployment saying the owner tried to fight the unemployment by saying I was discharged instead of laid off. She said I was fired because I was unable to learn the job and incapable of performing the job as required. She has also been calling me telling me to watch my back. She also has given me two very poor references and had told people that my husband is a 'pothead'. She told me that she was not paying me a penny and was going to find some way to sue me to get any money they have ever paid me back. I am tempted to go to small claims court to file for my money but now I am also being harrassed and blacklisted - what should I do???
Thanks!