Any chance I can sue CPS?

Since the details of the cps case are irrelevant to the question, I will not go into detail. We have a doctor able to testify that there is a medical explanation for injury that CPS is choosing to ignore. We have an attorney and we are working with her on the incident, but I would like some input. The injury happened when the baby was alone with my husband. My husband told them so, detailing the exact moment injury occured. However, the investigator told me I was also under investigation because the reason my husband was caring for the baby was because I had been tired, and she wanted to make sure our children were with "healthy" people. I was told if I did not sign a parenting plan agreeing to be supervised, she would take my children from the home. For a month and a half, I could not be alone with my children, so we brought people in to live with us. When I got up to feed my baby at night, I had to wake up our designated supervisor so they could WATCH me feed my baby. After the investigation was over, I was told that I was going to receive a decision of "ruled out" for abuse. A new parenting plan was outlined where I finally could be alone with my children. However, I never received my letter of decision from CPS. Our attorney contacted them to inform them of the oversight, only to find out I had never been under investigation. My question is can I take legal action against CPS for LITERALLY PRETENDING I was under investigation?