Hi Henrik7
Well done for reducing your HbA1c. You've done really well. Regarding reducing your medication, it would really be best if you had advice from either the GP or the Diabetes nurse, particularly as you are obviously not familiar with how the medications work.
Basically, the Metformin helps the insulin to be more effective so is unlikely to affect your every day blood glucose results. The Gliclazide stimulates your pancreas to put out more insulin to deal with the glucose into your system.
I believe your GP/Diabetic nurse will want to know what your HbA1c was before you stopped one of your tablets and will then, likely advise you to reduce the Gliclazide slowly, perhaps by only one tablet, maybe two, then have an HbA1c again in 3 months to see what your Glucose levels are with, maybe a view to reducing your Gliclazide further. I would imagine you will be advised to continue with Metformin for sometime after reducing the Gliclazide to none, and with having HbA1c testing to be sure your glucose isn't rising too much again.
So, please, please, please, do go to see your Diabetic nurse, come clean as to what meds you are currently taking and ask her advise and support etc. You really shouldn't be doing this on your own.
I presume you have a glucometer and are testing regularly? Are/were you having hypo's at all? If not, I would suggest stopping your meds was not a good idea, I'm afraid, but only the professionals can advise you here.
Good luck