My child father is keeping him from me with no parental rights

I have been allowing my sons father visitation with him. We were alternating back and forth every 2 days, he would have him 2 nights, then I would have him 2 nights… I was supposed to get my son back from his father on February 8th, but he has been ignoring all of my calls and messages and is refusing to allow me to get my son back. He will not even tell me how my son is doing… He has no parental rights, we were never married, and he isn’t on the birth certificate. On the 11th, I was served with papers for his father to establish paternity. He wants joint custody, a normalized visitation schedule, and paternity to be established, which I am fine with… However clearly I am not fine with my son being kept from me. I have contacted the local sheriffs department, state police, DHS, and literally anyone who I thought may be able to help me, but everyone keeps telling me to get an attorney… I am not understanding why I need an attorney in order to get my child back from his father when he has no legal rights. My son has never been away from me for more than 2 days at a time, when he was with his father… I miss him so much that I feel like my heart cant take it any longer… He is a mommas boy, and I know he is missing his momma and wondering where I am at, and that hurts me the most… I have been told that this is considered kidnapping, but when I went to file kidnapping charges at the local sheriffs department the deputy on duty looked at me like I was ignorant and told me to fill out an Affidavit. I just wanted to get some advice from an outsiders point of view to see if maybe this is something that I am missing that I can do to get my child back asap… His birthday is the 21st, and I can not miss his birthday…