I was grateful to have very minimal hair loss in my first year post-op when I lost the vast majority of weight. I'm bewildered as to why I'm losing it so profusely now, nearly two years since having the VSG in August of 2015 when I've essentially been in maintenance since December 2016. I've lost ten pounds in the past year, 75 in the year before it. In November of 2016 my endocrinologist put me on 1000 Mg of Metformin with the hope it could help with my PCOS (I'm not diabetic). Hair loss is not listed as a side effect for it, but in having searched online many have stated that they lost hair while taking it. However, many weren't certain if it was the medication itself, or the weight loss it helped them to achieve. For me, the weight loss was more minimal because my BMI was already 21 when I started taking it, and my body wasn't willing to budge much lower. The hair loss was insidious. A few years ago a horrible John Frieda product had caused immediate and profound hair damage and loss, so it was the obvious culprit. With this I hadn't realized I was losing so much hair until one day when it was suddenly obvious that I had. It's also breaking off.

I just had blood work last week, and my B12, thyroid, and Vitamin D levels are normal. My primary care doctor had ordered it, and he's not as knowledgeable as my endocrinologist (but you can get an appointment with him that month, whereas with my endocrinologist you have to book five months out). He was totally unhelpful about the hair loss, offering no potential explanations.

Has anyone else experienced hair loss so far out from having surgery, or while taking Metformin?

In younger pre-menopausal women, Metformin can definitely cause hair loss. I took 1000 for my diabetes and it made my hair shed more. Not drastically but it thinned my hair out.