Sally,
I'm disappointed to hear that you are back in the trenches. Forgetting all about hospitals, AAMDS, and Marrowforums is a luxury many patients (make that "former patients") would like to have, so I'm glad you were enjoying a regular life in recent years. Now we want to get you there again.
You might read or re-read
Andrea Pecor's Personal Profile. She would definitely dispute the claim that you can't repeat ATG as necessary.