Hi,
You are type 2, aren't you?
Very often, the problem that type 2s have is that their bodies are insulin resistant. This means that you need more insulin than a normal person, to have a normal effect.
So your pancreas is frantically pumping out as much insulin as it can. But because of your insulin resistance, is isn't enough. And the glucose is left circulating in the blood, rather than being stored as body fat. Hence your high BG levels.
Then your nurse gives you a medication which stimulates more insulin production from the pancreas. This overcomes some of your insulin resistence. The extra glucose that is circulating in the blood is tucked away into fat and your BG falls - and you put on weight.
In my opinion, the best solution is to do exactly what you are planning - reduce your carbs.
That way, bg doesn't rise so much, not so much insulin is needed, so insulin resistance falls, so less insulin is needed, so less strain on the pancreas, BG should reduce...
Hopefully you could enter a new cycle of lower BG and less medication (don't adjust your medication without advice from your nurse or doc!)
But, please bear in mind that Gliclazide can cause hypos.
So if you are going to introduce low carb I suggest you do it gradually, with close monitoring of your blood glucose, and preferably with your health care team aware of the change in diet.
I hope that made sense?