First thing I will say is do NOT post any more information here. Your community is only about 21,000 people, so someone from SSA may see your posts here.
Second, get or at least talk a criminal lawyer. If your husband is getting Social Security and working, he is not entitled to those benefits. And, that means you may have continued to receive benefits you know you are not eligible for. There may or may not be any criminal charges against you because you reported him, but I will bet SSA will come to you to get their money back.
Finally, you are not required to talk to the SSA investigators. And, since anything you say to those investigators could also be used against you, I again suggest you talk to a criminal attorney and have a discuss about your rights under the law in your jurisdiction.
Best of luck to you.
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I agree with the previous attorney, this may be a criminal matter. I would recommend you consult with an attorney in your area.
I am only licensed in Arkansas. No part of this answer should be construed as creating an attorney client relationship.