I need some help with my diabetes.

I'm type 2 diabetic, and I need your help and/or suggestions.

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I was diagnosed and put on metformin, but metformin kept crashing me while I was working - I am now taking onglyza (sp?) and it is making me feel nauseous but not really bringing down my numbers, they stay around 180-250.

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Also, after summer, I will be having weightloss surgery but I wanna bring down my numbers before I get the surgery.