Welcome to the forum!
I don't have type 2 diabetes myself (I have type 1) so I can't really offer a lot of advice here, but I'm sure there's someone else who can?
Have you changed the amount or types of food that you eat? Or it could be time to change your medication, though I'm not entirely sure (your doctor will be able to tell you this).
By the way, stress can affect your blood sugar levels too.
I hope you find a solution soon.