Thanks mj14.
I can't comment on Metformin as I have no personal experience, however vis-a-vis weight loss, I might urge you to be be patient for the time being. As Mo suggests, weight loss is rarely a linear exercise, and this can be exaggerated in females of the species. As, I'm sure you know all to well, we can experience cyclical weight fluctuations, and these can several pounds, in either direction, without anything being amiss. Did you track your weight before embarking on your lifestyle changes, and if you did, did you have any potentially cyclical changes?
Stick with the decent diet, and I guess stick with the medication. Who knows, one day you may wake to a few pounds lost apparently overnight.
I know weight loss and testing are our interim measures of success, but don't be disheartened.