Undiagnosed yet - Best times of the day to measure BG

Sounds to me that you are demonstrating all the classic symptoms of hypo, see your doctor and ask to see a specialist

As Paul suggests if you're getting that intensity of symptoms go to the doc and get yourself checked out properly. The symptoms you describe are hypo like and could be from a number of causes. If you are not on insulin or insulin stimulating drugs then your bodies liver dump mechanism will in most cases be able to cope even if you are getting low levels. The alternative is that you are suffering from false hypos. This is where your levels have been running high for a long time and your body produces hypo like symptoms at a far higher level than normal. Even though they are called "false" the symptoms can be very unpleasant.

If you get a meter then to do the same as diagnostic a fasting blood glucose test read here http://www.diabetes.co.uk/diabetes_care/fasting-blood-sugar-levels.html

An A1c test is more accurate as it will give you the average of your levels over the past three months or so.

By insulin test I guess you mean a c-peptide test. This will measure the amount of insulin you are producing. It's used as the definitive test to say if you are T1 or T2. In the UK its a very difficult test to get done if you are diagnosed T2 because it costs lots.

For general testing with the meter then test two hours after a meal and aim to be below 8. At all other times your levels should be between 4 & 7. See http://www.diabetes.co.uk/diabetes_care/blood-sugar-level-ranges.html

If you get your meter and it is showing you anything but that normal range of readings you should abandon your one month plan and go to the doctor immediately.