Hello and welcome,
Metformin is a useful aid if you can tolerate the side effects but it does not have as much effect as diet. Cutting carbs is really the way to go. Initially many people, myself included have what is called 'carb flu' but you will find that it passes. The body likes the status quo and resists change. However, it will like the new status quo of lower blood sugars even more.
I hav e the slow release metformin and have had no real side effects. I am happy to use any tool to help me use diet as a way of controlling my blood sugar levels.
Good luck and welcome.