Let's put it a slightly different way @asparaagusp, you are quite unusual in that you are using Gliclazide, Metformin and Lantus together. Your glucose levels this morning, from what I can see were very good, and the blood test results you got were within the normal potential deviation of the meter you were using (0.6 change on 4.7 is 12.6% which is within the 15% tolerance) .
As a result, it's questionable as to what you saw. Was it:
- An aberration in glucose readings emanating from the meter?
- A sudden drop caused by Gliclazide before eating breakfast?
- Normal deviation within blood glucose levels at a level that is normal?
The normal advice in T1 terms relating to seeing something that you've never seen before is not to change it after the first occurrence, and I think that applies here too. You only change it if there is a clear pattern with the same thing happening on multiple occasions. So as it stands, don't change the Gliclazide.
See what happens with the same breakfast on the next two days and make an assessment based on a fuller set of data rather than a knee jerk reaction to a one off, however disturbing it might have been for you.