I have gestational diabetes. I know the one thing they will tell you if there are any issues with his sugar is to watch his diet. You want him to have 4-6 meals a day. (Breakfast, snack, lunch, snack, dinner and a snack). You want to make sure that each meal is pretty balanced. Also, you want to watch his carb intake and sugar intake. For instance, you don't want him to drink juice throughout the day. Juice is very high in sugar and it quickly goes into your blood. Try some of the flavored waters that are sugar free (I drink them and my almost 3 year old son loves them). Propel has a little bit of sugar but most of the others don't. Also, you want to try to watch which carbs he has. Some are higher on the Glucose Index than others. You can search online for some help with those. A book I found really helpful was the Sugar Busters diet. It helped me to change my diet a little so it was better balanced. It, also, helped me to figure out which carbs were better for me.
I'm not sure where the one person who sent you some glucose numbers got their information. The Juvenile Diabetes Research Foundation International listed the optimum blood glucose levels as: Before Meals 70-110 mg/dl; At Bedtime: 100-140 mg/dl. You can check their website at http://www.jdrf.org
I know for most people if your sugar levels go below 70 it is cause for worry because that is where most people start to feel the symptoms of hypoglycemia. Usually a before meal sugar is taken approximately 2 hours after having eaten your last meal or first thing in the morning. Please double check with your doctor where his glucose levels should be. Don't just take my word or this other persons. By all means, if you are overly concerned about those sugar readings, call your doctor back first thing tomorrow morning.
It does sound like your son is having symptoms that could be attributed to diabetes. But it could be explained by other things as well.
Try not to worry too much. You'll get the results back soon and then you'll know what to do. His readings the other day could simply be because he had had too much milk or juice too close to when you did the reading. They will both raise your sugar levels quickly.
I hope this helps and good luck with your son.