Natural Supplements and Home Remedies for Lowering Blood Sugar

I have Type 2 Diabetics and using metformin which is causing me nerve pains. I have been searching for natural supplements to lower my blood sugar, but can't get anything that works. I have bought berberine but is not working. I am not sure if I bought the right thing. Can somebody help me with something that works because I want to be off Metformin as urgent as possible.