(Sort of off-topic post, but lots on EDS.)
CHS - I am sorry to read that your son also suffers from EDS.
EDS in its all found forms is a disabilitating condition. I have type III, the hypermobilia one, but I show a great number of symptoms from I and II category too.
I used to sit in the sidelines at school too often when others did gym and the like. But I guess pigheaded enough to still try. The number of times I broke bones on my toes is staggering. And I have no idea how many hairline fractures I had growing up - the doctors were perplexed back then too, when I dislocated a shoulder and a few days later it was better, until it happened again and again. But nobody suspected that anything was wrong. I just "grew quickly".
I learned to keep myself entertained too. Computers were my friends, and the early days of Internet was my great social saviour. I later on made it my profession, so it couldn't have been all bad, right? Not that my mother liked me playing on computer for 16 hours at a time, but I got hooked on Civilization!
I hope this doesn't offend you, but consider cutting your kid a break if he actually gets into something that helps to keep him occupied. Not that he should stop doing house chores and school work, but maybe once in a while, let him get "into a groove" for hours on a time. It'll help mentally to get good at something, despite your body not functioning the way it is supposed to.
For EDS, the long term prognosis is bad physically, but it also extremely traumatizing to experience multiple dislocations, fractures and other medical issues all the time. If he has no access to psychological help, encourage him to start writing a diary or a blog, and discuss with him what it all means to live with a this type of disease. It might not help now when he is a teen, but it will help when he becomes an adult.
Another thing that has helped me now, that my EDS has taken a turn for worse big time, is that I've done years of martial arts. Not only has it been a useful channel to vent my frustrations on headaches,

but the biggest thing it has given me is control of my body movement and learning to use my body in natural ways - and to use my whole body to do things, not just my hand or arm.
Maybe try enrolling him into a tai chi-class could help? Or dancing or anything he has to use his body and learn to control his movements.
Falling down the correct way also prevents unnecessary trauma to your body. Here in Finland at winter times the number of people who fall due to slipping on ice and actually break bones, is huge. And it is even a cause of death on the elderly due to complications of a broken hip etc! There is now a pilot program of local judo associations, that they started teaching the elderly how to fall correctly and not break hips, hands or legs. And the results have been really good so far.
To summarize - any help in a total body control is good. Getting more strength in muscles all over is even better. Learning to protect your body in surprising situations is priceless.
I hope you find a forum for EDS for your son, since finding information is hard on any rare disease. That's why I was so happy to find one for CH! Also the fact that people here know more than 99.9% of doctors out there ain't nothing to snuff about either.

But if you wish to talk more about EDS and how to survive with it, don't hesitate to PM me. I'd be happy to share anything I've learned over the years.