Thank you all so much. I've read all these replies, several times, and it has helped a great deal.
I can't write much - it seems I just can't open up right now - but I do want everyone to know that I feel much better, that I'm seeing that I made the right decision. I went through another terrible night last night, with several sobbing jags, but when it was over, I knew I was grieving for the losses (his life, my dreams for his future), not crying with remorse.
I know I did what had to be done... it will just take time to heal. (And he will always be my "sweet baby.)
I hope to come help others here, soon, when I am able to do it (emotionally).
Love to all, and my heartfelt prayers for your own healing.