I have been a "borderline" diabetic for years. The only time that I get shaky is about 2.5 hours after breakfast. At that time, my bloodsugar is low, under 70. Sometimes, it can even get to the high 50's. I'll get shaky, clammy, confused, and "out of it".
When my sugar is high, I am unable to concentrate on anything and hyper. The only time I'm high is when I have pasta or pizza really. My last A1C was 5.7 - normal but on the high side. 6.0 is considered mild diabetic. I FAILED my 2-hour glucose test this past February. Like I said, I am "borderline". I don't take anything since I am still able to control it with diet alone.
You might be "borderline" like me. Exercise and diet should help you keep it in check. Since your tests are coming back okay, I don't think you have much to worry about. Pay closer attention to what you are eating or not eating when you feel those sensations. Try to find out what your triggers are. Mine are soda, pizza, pasta, juices, and candy. I can still have them but in moderation. As a matter of fact if I am low before lunch and in a sticky situation, I quick drink a can of regular soda. Then, I eat a meal about 1 hour later. Try and find out what your triggers are. <img src="i/expressions/face-icon-small-smile.gif" border="0">