I cannot speak to the amaryl situation. I do know that when I started taking metformin I was 251 pounds and just something like 9 months I was 181. I tell people that I did not loose weight as much as I just deflated.
Weight loss goes along with metformin - It should take a little while, but it will come off if metformin lives up to its reputation. Of course, just like everything else there are other things to consider like other medications, how much you do eat and where your blood glucose levels stay.