Find a lawyer who specializes in fraud defense. Those kinds of lawyers might have some strategies to help you to reclaim your lost funds. Also, call the stock broker and explain to him that the broker has been defrauded. Be prepared to back up these allegations with proof, otherwise it's just your word versus theirs.
Best of luck.
Contact a local attorney that deals with fraud and consumer protection. I would also follow up with the police and try and generate as much evidence as possible. Since you are dealing with interstate fraud this should also include a federal case. Talk to an attorney as soon as possible.