My Son Has Been Kept Away From Me For 15 Years

I'm knew to this so bare with me and I know I may get ridiculed by some but that's ok

I'm a 35 year old man who stays in Brooklyn who's been fighting to be apart of his child's life for 15 years

To give you guys some background..I was arrested back in feb 2009 and sentenced to 5 years my son was born oct 11 2009.(I was on the phone the entire pregnancy) at that time I assumed my name was out on Tommy sons birth certificate.it got a little rough for her so she moved from my grandma house to my sister and mothers house in another state.My child's mother decided she couldn't do it nomore and disappeared.no one could find her until I got home 2013 and found her on Facebook. I've tried over and over to see my son she would not tell me where he was she only demanded money.I rebutled I'm not sending u money for a child I'm not seeeing tell me what he likes and I'll buy and then I get cursed out and not hear from her for months.but I've always wrote her VIA Facebook every holiday checking on my son and sometimes she will answer most the times she won't. I finally said enough is enough after she made me stay outside for 8 hrs waiting on her to show up so we can establish a connect for my son.(back story when my GMA died 2014 I went to a shakier got my own apt which I reside in now) I've been in court for about 14-15 months and today was suppose to me my trail date but some how some way she produced a birth certificate without my name on it so now I have no parental rights.i put a petition in to get dna and now she trying to equitable estoppel and have her husband adopt my son Like all this is really crazy to me cuz it doesn't take a blind person to see she's manipulating the system. Is there any way I can prove that she's purposely keeping my kid away from me that can help me in this case because it's not like I abandoned my son.I've been looking for him and tryna be apart of his life since birth but my rights has been took from me aginist my will.i have no money to pay thousands of dollars for a attorney.im really stuck between a rock and a hard place Can someone please tell me something that can help me