Our expert says:
Difficult question. It might be a number of things, it might be one thing, difficult to say.
I think overall, the symptoms point to a lack of energy in the diet - being peckish and light headed suggest low blood sugar, and that may be the result of your diet. Perhaps it's not replacing as much energy as it should. The thirst could be linked, because we get much of our fluid from the food we eat.
The flushed feeling, I'm not sure about. That sounds like something to do with circulation, which is difficult to explain. It may be related to how your body is responding to energy though, in that you have to "mobilize" energy after training and a side-effect of this is feeling flushed.
I would look at diet, then, as the likely solution. Specifically, what you eat and how much. It sounds like you eat often enough, but perhaps it's a matter of eating more, or changing the type of food. So at the risk of passing the buck, I'd look at seeing a dietician again.
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