I have ME so lots of sympathy to your DS.
It is a nasty illness and will as I'm sure you are aware will effect him physcially and mentally.
Things that help me:
not doing too much on anyone day and 'listening to my body'
after a long and agonising decision antidepressants (on a very low dose)they have MASSIVELY helped but were nasty to start with for about 3 weeks (felt suicidal).
Cognative Behavioural Therapy
Changing diet - No wheat (found out allergic) little sugar. lots of slow burn food (porridge etc).
avoiding aerobic exercise
avoiding alcohol (shouldnt be too much of an issue!)
Acupuncture/reflexology
my cousin had ME and completely swore to 'mickle therapy'(sp?) she is much better now. I can't afford to go to the therapy and it isn't available on the NHS.
If my DH were here he would also offer his sympathies to you. I do have mood swings and can't 'deal' with stress well and get a bit over the top hysterical. This has almost gone since being on the antidepressants though. It can be very frustrating to live with. Also as he will probably seem ok one mintute then not the next it can be hard to understand.
Action for ME is a useful website.
there are also ME clinic as across the country and some consultants are ME specialists. Push for them, I went to one outside of my bourgh.
A good book to read is 'living with ME'.
Your poor boy, it's hard as an adult but worse as a child I really hope he starts feeling better soon.