I'm about to take my first dosage of metformin today.

Two questions -

1. If metformin is an insulin sensitizer and my insulin levels are already way down because of the lo carb diet (I'm on 20g / day at present), won't I have like a low blood sugar crash? Should I increase my carbs slightly when I go on the met?

2. WIll I really need to take met for the rest of my life? I was kind of under the impression that once the weight is off and my insulin levels and periods are normalised, I would be able to wean off the met and control with diet alone? Is that not true?

Thanks