@Carptastic - I'm not defending your Doc, or suggesting you are wrong, but many drug patient information leaflets make grim reading.
In terms of how Metformin works; it sort of oils the wheels of how our bodies deal with insulin - whether our own or injected. It just helps it work a bit more efficiently.
Metformin is a drug used by many, many T2, but also, it seems increasingly more T1s. Unfortunately, if my memory serves me correctly, about 10% of people taking it have tummy upsets in the early days. In most cases it passes, or the slow release, which your Doc seems to be suggesting, can be tried. It is usually very well tolerated. Some do find it best to increase their dosing levels slowly, in order to help their tolerance to the medication build up.
For those carrying any extra weight, it can help them trim up a little, but not everyone loses weight whilst taking it.
It makes sense that you have a conversation with your team, to address your concerns. How did you come to be diagnosed? Did you become very unwell? Do you see anyone at a hospital clinic?
Sorry for all the questions, but it just helps people ensure they offer you suitable thoughts.