Hi Jill,
You're exercising. Your doctor is adjusting meds, and now you have your meter. This is all great! You're on your way to getting control and avoiding complications! Here is a link to advice used by hundreds if not thousands of diabetics to control their numbers:
Test, Test, Test
As others have said, it may take some time for the metformin to become fully effective. I've read up to a month to get in your system fully.
Also, you might want to try a small snack before exercising, something like 1/2 cup cottage cheese is enough to prevent a glucose dump.
You can still manage a snack before bedtime and continue to lose weight. I do it on 1200 calories per day. My most common late night snacks are 1/4 cup of smoked almonds, (170 calories and 5 carbs), or an Atkins Caramel Double Chocolate Crunch bar, (150 calories and 10 net carbs).
I keep track of everything I eat on
Fitday. Eating to my meter has turned out to be the best motivator ever for me.
We all vary on the amount of carbs we can tolerate and still keep our numbers in control. Many of us find we can eat very few carbs for breakfast at all and can tolerate more later in the day. This might mean eggs and cheese for breakfast. Or I can eat one slice of Brownberry Carb Counting bread with a tbsp. of peanut butter or an egg, etc.
There are lots of low carb options in the stores these days. As you get started feel free to ask more questions. It'll be OK. You have some time to figure this out, and the fact that you're here posting tells me that you will.
FTW