If your blood glucose was 61 an hour or two after breakfast, especially if your breakfast was fairly high carb (such as cereal, bread, etc) you might have a specific type of hypoglycemia called reactive hypoglycemia which is people who have
low blood sugar after a meal high in carbs. I would suggest seeing your doctor and getting tested to see what type of hypoglycemia you have and to make sure you aren't pre-diabetes.