I believe I may be able to shed some light on potential causations for what caused the problem in the first place. I experienced most of what your son is experiencing as a result of my toxic mold exposure. It has very far reaching effects on the human body, in ways most people do not connect to everyday mold exposures.
First, Everything in the previous postings is very good advice. The body is very adaptable. It hides toxins in fat tissues. If the body takes in more toxins, it produces more fat to contain the additional toxins. I believe the body does this to seperate the harmful toxins from critical systems and organs. But, it can only do so much. Every weight loss system should include a detoxification program. The toxins damage many of the body's operating systems. This accounts for the lack of peeing control, the constipation, and the rashes where the toxins are trying to get out of the body. The cleanses and colonics will be very beneficial for both.
During the course of the past five years of extensive research on how toxic mold effects the human body the way it does I ran across some excellent research done at Oregon State University on chlorophyllin: http://oregonstate.edu/dept/ncs/newsarch/2001/Nov01/liver.htm and
http://extension.oregonstate.edu/oap/story.php?S_No=8&storyType=oap&page=1 .
It reduces absorbtion of the toxins by 50%. When I travelled to see Dr Bailey, he said they used 100mg three times a day during the trial in China. It reduced liver cancer 50%. I had a trainee at work who had diabetes, was about 350-400 lbs, and had very bad body odor. He used to be an exterminator , using a lot of chemicals. He started taking the chlorophyllin gel caps and drinking a lot of GOOD water each day. Then I didn't see him for a month or so. When I did I hardly recognized him as he walked towards me. He had lost a LOT of weight and had just passed his life insurance physical with flying colors. I was shocked at how well it helped him. No one else has had such a dramatic effect. I believe it was because so much of his fat was from toxins. I take chlorophyllin each day. It took away my constipation. It is like eating a lot of green vegetables in concentrated form. And it is the growth, generative elements. It is interesting to look on the label of the bottle to see it is for odor control. In liquid form it is used to take the odor out in colostomy bags.
Now for the source of the toxins. Do you have ANY mold in your home or preschool? If so, that is your source for the mycotoxins. They effect the brain and central nervous system, causing all kinds of problems. If this is the case, email me and I will give you free access to all my research and personally guide you through this arena.