Adoptive Mother's Feelings Of Betrayal

I've been searching for more than 3 years for a support group for my particular issue. I hope I've found the right one. However, in reading the many posts here at adoption.com, I've noticed that no one seems to have quite the problem I have.My son, age 25 and in the Army, was adopted when he ws 3 days old. Yes, we are older adoptive parents, but we have loved our son since day one. Three years ago, while he was deployed to Iraq, I received a one line email from him stating, "can you send me the name of the adoption agency...the search begins....lol". That was the beginning of a very downward spiral for his and my relationship. We have always been out front and open about his adoption and answered all the age appropriate questions he's ever had. We told him everything truthfully, lovingly and supportively. Never did he ever exhibit the least bit of interest or desire to search for his birth mother until that email. After talking to my husband that day, we sent him the information he asked for, only to find out some days later that he had already....before emailing me asking for the agency....found the agency himself and had made contact with his birth mother through the agency who was holding a letter from her for him in case he ever contacted them. Needless to say, I was hurt and devastated, not because he even wanted to search, but for the way he went about it, totally behind my back. Since then, things have gotten worse. He has two step-sisters who he refers to as his sisters (he was our only child) and to make things truly worse, he took off the Christmas he arrived back from Iraq to go be with his birth family for the holidays. Since then, there are always posts back and forth on his Facebook between him and his birth mother, and she is always acting like his mother, giving advice and encouragement right after I do. In my mind, I see this as her trying to one up me. She even refers to him as her son. When my son did this hurtful search and reconnection the way he did it, I felt something die inside of me. It took me no time to realize that there is no one out there in the world of adoption who is concerned or cares about the adoptive parents. When all this happened, I contacted the adoption agency and was told, in no uncertain terms, that he is 21 and he can do what he wants. AND they reiterated many times that their only concern in any adoption in order of importance is first the birth mother, second, the child, third the adoptive parents. We told them that we felt like we were nothing more than a walking ATM to them and that no one cares about us when we need caring about as much as the birth mother and child do, and especially when we are being told to just deal with whatever has happened because our child has a right to do what he did.Over the last 3 years, my own relationship with my son has become very fragile. I know there are adoptive parents who claim they are okay with their child searching and reconnecting and even support this, but I don't feel the same way. Maybe its because of the way my son did this that's really torn us apart, but I need someone to talk to about this before I lose my mind. I still love my son, but I no longer crave his presence or even care if I see him. Looking at him reminds me of what he did and how he now has this other family that is clearly important enough to him to call them his sisters, and maybe he even calls his birth mother Mom....I don't know. I've asked him, but he's a good liar and I don't believe him when he says he only calls her by her name. I have told him that I am hurt and that this has affected our relationship in ways he cannot begin to imagine. He tells me I'm being stupid. I've told him that, had he ever just come to us and presented his wishes to find his birth mother, that we would have been supportive and would have hoped he'd want to share meeting her and her family with us. He just laughed me off and said that if he wanted to go see them, he'd just go....he didn't need us to do that. So, he has just been returned again from a second Iraq deployment and spent his leave at home with us. But I didn't enjoy one minute of it, knowing that he has so much going on behind our backs with his birth family. I literally couldn't wait till he returned to base. When he did this to us three years ago, I literally had anxiety issues that I've never had before and had to be under a doctor's care for it. Whenever my son is around me now, I am filled with this anxiety again and need to reach out to my medication, just to deal with the affects his actions have taken on my heart. As I said, deep inside I love my son, but I feel so much has died as a result of his actions, culminating in my feelings of rejection and being pushed to the background of his life. My husband feels the same in some ways, but not nearly as deeply as I do. Afterall, it wasn't his birth father he secretly searched for, it was his birth mother, and therefore affected me more deeply.I don't know what I really need. Maybe I'm just hoping that someone on this forum has had similar issues that they have dealt with. I have searched my soul and I am sure I'm not feeling anger as much as I am hurt by what he has so callously done to this family. If there's anyone out there who knows what I'm feeling, I sure would love to have some feedback and support.