@sheepie123
I am on Metformin and I have definitely had hypos. It was in the days when I exercised like a made person and before I had the level of control I have now and it happened several times when I out-exercised my body's store of glucose. I agree that its unusual and hasn't happened since I stopped exercising like that but I have heard of other diabetics having hypos while taking Metformin.
I expect that if you had done nothing and just rested, your body would have sorted it out its self, unlike someone on Insulin. I think what you had is no different from any runner "hitting the wall".