What would you do to decide if you have low blood sugar?

Blood test.: To make the diagnosis of low blood sugar a blood glucose test is required. Preferably at the time of any symptoms.

Check the sugar: Best thing to do is check the blood sugar to see where it is. Sympt of low bs include dizziness, sweating, fatigue, palpitations, nausea, tremors, confusion. However, not everyone will have symptoms especially if they have low bs often.

Rare disorder: Symptoms include nervousness, sweating, hunger, anxiety, blurred vision, fatigue, fast heart rate, etc. -- however unless you have diabetes and are on Insulin or other medication, have renal or liver disease, cancer or prior stomach surgery -- then true hypoglycemia never occurs in human beings. If it a very frequently and incorrectly made diagnosis.