Hi there. I know a great deal about hypoglycemia because I have a kind of severe reactive hypoglycemia most people will never get. It is indirectly caused by surgury I had. I have almost died from it. A lot of the things folks are saying are true. Beware of fruit juices. They raise your blood sugar very quickly. I use them only in emergencies and even then i must eat real food within 20 minutes or end up with a blood sugar level bottoming out. The usual test they use here is the glucose tolerance test. It will depict what your body does with sugar... how it reacts to it. I firmly believe many folks have trouble with unstable/low blood sugars .... it is just a matter of degree. Your family doctor can order the test for you. I have a glucometer .... if you know anyone close who would test your blood for you when you are having symptoms that would be helpful. Cause that will tell you how low you are .... though glucometers are not as accurate with low readings as with high or normal ones. Here in Canada anything below 4 is considered low. People vary as to when they start getting symptoms though. Some people experience symptoms even when their sugar is in a normal range but LOW FOR THEM whereas I can go lower than 4 with less symptoms because my body is adapted to it.