First, I doubt that metformin is affecting your kidney function–especially at the low dose you are taking. Likewise, I’m not surprised that your blood sugar and weight failed to budge at such a minimal dose. I routinely prescribe 500 mg three times daily for most patients.
Your high protein diet may be the cause of your elevated BUN and creatinine. More accurate indicators of kidney function are GFR (glomerular filtration rate) and especially, cystatine C.
Before your next blood test, make sure you drink a lot of water (many people, while fasting for their blood tests, also avoid drinking liquids, and are therefor dehydrated, causing a false elevation of BUN and creatinine).
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