Hi Veggiemom
Various foods used to make me feel like that,plus a whole range of other symptoms.Wheat &sugar are 2 of the big ones,though &I don't touch them anymore.
It's great that we realise this because many people experience these reactions after eating foods that don't agree with them,but their diet would be the last place they might look for the culprit.It can be sometimes tricky to identify as some allergies/intolerances have a delayed reaction which sucks because you have to figure out what you ate for the last 2 days!
Children can be so sensitive to these foods,I remember a nutritional therapist said to me to watch for reactions from my son,Children are like the canaries in the tunnel, if he has the slightest bit of wheat,he is guaranteed a tantrum later on.I don't give him these foods.
The good news is these reactions should not last longer than 3 days,as the digestive tract repairs any damage in that time.
And usually it is enough to turn you off the culprit food.