I already take 500 mg Metaformin, 2 tablets twice daily plus Gliclazide 30 mg, once a day. I don't always remember to take them and some days, I eat sweets. I 've learned to eat a vegetable broth soup with a dribbled egg, for 2-3 days to help bring my sugars down. Yes, it works. Talk to your Dr and see if there's options to permitted 'doseage' you're allowed. He may offer a new amount.
Maybe you need something else. Maybe a smaller dose of glipizide with the metformin. Your doctor has to prescribe that
It’s possible that Metformin isn’t the right medication for you. There quite a few other medications you can try. I’ve read about Berberine, but wouldn’t use it unless the doctor okays it. From what I’ve read, Berberine is supposed to work the same/similar way as Metformin, so if Metformin isn’t working, it’s likely Berberine wouldn’t work either.
You should talk to your doctor and ask for a different medication that might work better.