How's the new medication januvia working?

My wife takes Januvia. It wasn't quite enough so the doc tried Janumet. It didn't work out, so now she's back on the Januvia and Glucomet? at night.
 At one time she used diet and exercise to successfully become diabetes free, after losing 180 pounds with a stomach operation. Unfortunately, her knees and one hip went bad and she gained some of the weight back and now is trying these things while recovering. So there seems to be an awful lot of trial and error in treating diabetes. I would definitely try exercise and diet like Mr.Peachy suggested before moving on to medications.