Help adjusting when decades of managing prediabetes no longer works

For those of us who have controlled prediabetes for decades, but the progressive T2 disease no longer responds as well as it used to, suggestions to keep the control going to suffiently ward off the inevitable? Exercise is tough, because I can barely walk. I suffered nerve injuries during surgeries, sciatic, peroneal, LFCN, right leg. Gabapentin side effects, NSAIDs prohibited due to CKD. Tylenol doesn't touch the pain. Using hand weights, to try and get moving after cleaning up meals. I cut food consumption by 50%, then again by 25%, still not losing excess weight due to my T2 insulin resistance. This disease is hopeless when you get to the point no diet plan nor exercise controls it any longer. According to my FBG, I have crossed over into T2 diabetes. A1C goes up by a tenth of a point every six months blood draw. I’ve changed internist, as the last one doesn’t seem to care that my BP, cholesterol, blood sugar meds need adjusted. Cardiologist has now adjusted the BP and cholesterol meds. Will see if new doc will help with the T2, next appointment. Or maybe try and get referred to endocrinologist.
Lastly, on Medicare, cannot afford the newer T2 medications, copays aren’t doable for us.