Thanks Unescorted. The hardest thing is the worry about what will happen if heaven forfend I should feed him something slightly different from the norm. For example Rice Krispies are fine, but Corn Flakes give him a whole night of abdominal pain. Neither have wheat in them, but neither are coeliac approved because of barley malt flavouring.
Then I get told off for being an anxious mother which annoys the crap out of me and is hard to disagree with, because I am an anxious mother.
However, a neighbour of mine who is a consultant medic has a child with all the same problems, and she has all the same worries and frustrations about trying different foods on her ds, and about being called anxious, so that really helps me to feel that I am not alone in the problem.
Oddly, ds is not picky really because he never gets given anything that won't work well with his system so he is very trusting of food. #Error