You must be worn away with worry. Can you maybe go back to your GP and find out whether there are any more resources available - I'm thinking of a multi-pronged approach. Is there a centre that offers an intensive therapy involving a number of modalities at once? Or maybe it's worth talking to other families or finding out if there are any less conventional therapies like acupuncture, psycho-therapy, or rebirthing that may have been found to be effective?