Couple of things: A HbA1C can fluctuate some, it's not the end of the world. Any ground lost can be regained. Considering where you came from, it's still a pretty good result, and nothing to sneeze at. And if you know it's because of carb-creep, then you know where the problem lies, and you can fix it.
That said, weight loss is more difficult for women over, let us say, 40. (I'm no good with numbers, but everything in the peri-menopausal range and beyond, basically.). I put on weight very easily, it takes me a loooong time to get it back off though, while in my pre-40's it went relatively quick, in spite of a wonky thyroid. Maybe rather than trying drugs, you might go for a walk after an evening meal? Fewer side effects, and quite pleasant. (I'm not dead set against medicinal help mind you, but I don't know where you're getting it from, and I don't trust online sellers and such. Bit weary.).
In any case... Just clean up your diet, it'll make a difference, I'm sure. What does your current routine look like, maybe there's a pitfall somewhere?