Welcome Richard
It's all about what you eat, carbs when digested release glucose, protein and fat not so much.
T2's usually produce lots of insulin but that insulin becomes less effective (insulin resistance)
Every time we eat carbs our pancreas is forced to produce more insulin, the more insulin we have circulating the more resistant we get to it.
The solution for many of us is to stop eating carbs, less carbs = lower blood glucose = less insulin.
The Saxagliptin is a drug that forces your pancreas to produce even more insulin, only really helpful if your insulin production failing. If your pancreas is working normally forcing it to produce more is just making your insulin resistance worse.
It's quite common for Dr's to treat the symptom (high blood sugar) not the problem (insulin resistance)
has your insulin production been checked?