I'm not saying you're not diabetic (I don't know), but it's worth noting that hypoglycemia can occur in non diabetics (rarely, but it's possible). I suggest you go to this page and read the whole lot to consider some posibilities.
Hypoglycemia
Google is your friend (taken with a HUGE pinch of salt of course)... and doctors should be too (I'm surprised all those specialists hadn't heard about reactive hypoglycemia)