I agree that you should seek a second opinion. You do not have to be sick to have diabetes. Many of our kids are very sick at diagnosis, because they are in dka. Much better to catch it before that happens.
That 2.3 is just as scary as the 15.2, in my opinion. See if your GP will refer him to a pediatric endocrinologist. Something is clearly going on with that wide range of highs and lows.
If you were in Sydney, I'd tell you to go to Westmead. My son was taken there from our local hospital by a NETS team when he was diagnosed. The endo group there is fantastic. I don't know anybody in Brisbane, unfortunately.
mum to Campbell (16) dx July 2007, T:slim & Dexcom; & Thomas (12) non-D