Yes you should take your metformin i have been a diabetic since i was 13 years old and check it aleast 3 times a day and make sure you try to eat at the same times every day
Fasting if 105 is still higher than ideal. Ideal is in the 80s. What is your blood sugar 2 hours after eating?
What was your ladt hba1c?
Yes you should take your metformin. Probably as soon add you get up and before eating. Remember to eat low carb and avoid Sugars, which will also help in blood sugar management.