Wow! I am glad to hear it. I was really nervous when I heaard about the "gas chamber". Yikes!!
I remember the 'gas chamber' well...that may have been one of the worst experiences of my life...but it lasted for about 30 minutes, then we went on to other fun stuff, like shooting guns and tossing grenades.
Hang in there...the difference when he comes home will be like night and day, and it'll be a good difference.