Hi,
This is easily explained. When you did not take your diabetic medicines, you had Hyperglycemia, or too much sugar in the blood. The diabetic medicines are meant to lower your blood sugar, and if you do not take them, you will have excess of sugar in your blood. The symptoms that you experienced, of tiredness, disorientation, confusion, etc. are typical symptoms of this hyperglycaemia.
You should be very careful not to miss your doses as this might even lead to a serious condition called diabetic coma.
You should read up here to get more info on your condition:
http://diabetes.webmd.com/diabetes-hyperglycemiaI hope this answer was helpful. If you need more information, feel free to ask. For accepting this answer, please click on the green 'accept' button below. Feedback/Bonus will be warmly appreciated.