I Have Been Diagnosed With Type 2 Diabetes Nearly Two

I have been diagnosed with type 2 diabetes nearly two years ago. Very new for me considering I am not over weight. I workout weekly, eat reasonably, and am in good shape. Since I've been taking the prescribed medications for the past year and 10 months, I have lost over 20 pounds. My start weight was 185 at 5"11. Now I'm at 163 lbs. and still losing weight. Why am I still losing weight? Will my weight loss level off? I'm concerned.