Some people get an insulin spike from artificial sweeteners, because the body can't tell the difference. So it wouldn't help, if that is the case for you. Some (like me) have their gut bacteria die off. There's been research linking it to cancer. I can't say where your T2 came from though. Could be anything. Genetic predisposition is usually there, combined with what, to cause the steep rise in HbA1c? Stress, sleepless nights/shiftwork, statins for cholesterol, steroids... Could just be that your pancreas stopped being able to keep up with insulin production after a long time of keeping your levels perfect by pumping out massive loads of it. Who knows. I do know I feel better since quitting all sweeteners except for erythritol and Stevia, and even those I rarely ever use. But did it cause the diabetes? Most likely you were on that road as it was. If your insulin output did increase, well... It sped things up, possibly. But there's no way of telling now.