Hi rayles, sorry to hear of your heart attack, I hope you’re recovering well. Your blood sugar levels could be a couple of things that I can think of. The stress and recovery from your heart attack could account for it. However I think more likely are the drugs you have been put on. Statins especially are well known for messing with blood sugars. I’m not suggesting you stop any meds without consulting your dr but it’s worth looking at and discussing with your GP.