A common problem for a lot of people who try the diet is that they go from a diet with lots of sugar (wheat and corn contain sugar for instance) to one with less sugar. You also are changing the amount of food you eat and this can affect blood sugar levels.
I experienced blood sugar issues for awhile and its all due to me not eating enough food and not eating my meals at good times of the day. It could be a lifestyle issue and not candida.
Its hard to say for certain what you experiencing but you definitely feel weird and unusual changes occur when you go through die-off.