You poor thing!! I havnt been in your situation but thought i would just say that it is an amazing thing you are doing for your stepson, I work with children everyday and have had my fair share of ADD and ADHD, so in some ways i understand but i couldnt imagine having it 24hrs a day 7 days a week! All i can think of is the room your SDS uses, is it bigger then DD room could they swap?? All the best with everything!