Normal HR is 60-100 and having a higher rhr correlates with risk of heart problems as does having poor blood sugars and high insulin levels in your body. When we improve our cardiovascular fitness the heart rate can reduce over the medium and long term. Stress and anxiety could cause this elevated resting HR (it is totally normal for it to increase during exercise). If you are diabetic this doesn't just refer to emotional stress but also physiological stress. Personally, I'd go back and ask for some further investigation e.g. a calcium scan to see what your arteries look like https://ihda.ie/ and I would think about how I could improve bg control. There are loads of suggestions on this forum.