doodles, if it helps any, I found it a huge help to not just let her go INTO THE WORLD, but to let her go and to GIVE HER TO GOD.
Maybe if you prayed "Lord, here, YOU take him -- I have done my best, and I am weak and need to renew my strength. Please take him and watch over him and keep him safe. Continue to deal with his heart, that it may soften toward you and -- if it be Your will -- toward me, and that he will find happiness in his life. I cannot do this anymore -- please care for him."
When I did that, I felt an enormous peace wash over me.