Hi. I'm online and happy to answer your question today.
I would start up your metformin at the dose you are supposed to be taking it....if not your blood glucose may be too high to have your surgery on the day you are supposed to have it. There is no problem to starting it up again now....it should not lead to lactic acidosis.
Does this make sense to you?
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I see that you are offline. I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)