Hi Iambackwards,
Sorry if my previous message was a bit harsh,I felt it was and I apologise, didn't want to have a go.
However I do think you are taking a huge risk taking metformin with insulin without advice, as it could make hypos more dangerous. Especially night-hypos, as metformin suppresses the production of glucose from the liver.
If you took the time to research metformin, did you do the same with analogue insulins? I continually hear people saying I'm on this insulin or that insulin, and I want to scream, you are NOT on insulin! Analogue insulins just do not work for many people, and anyone using them IS the long-tem study for their safety.
You've not been diagnosed with 'insulin resistance', you've come to that conclusion because you are having problems controllling your sugars on the analogue insulins and regime you're on. My quality of life was so poor on Lantus, I think if my doc had suggested metformin, I'd have jumped off a bridge-seriously. My docs were quite happy that my BGs were fluctuating and uncontrolled, it was me that was starting to think I was insulin resistant, as there was no pattern to my lousy control.
Jus