Hello. Thank you for your question and welcome to HCM. I understand your concerns. During diabetes, especially in subjects that have poorly controlled diabetes, it comes at a moment that small vessels of the body and nerves become affected. Therefore, it is not surprising that a diabetic patient lacks the specific symptom of coronary artery disease - angina. Instead, these patients more likely tend to have non-specific symptoms, such as dyspnea (shortness of breath), sweating, drowsiness and/or tenderness in places where angina usually radiates (in your case, the left arm). I will not go on and say that this is definitely coronary artery disease, but there is a chance it is. So, I would recommend you to go to the clinic, with or without these symptoms, have an EKG, echocardiogram and a cardiac stress test, eventually a coronary angiogram. If you are diagnosed with coronary artery disease, proper treatment should be undertaken immediately. I hope I was helpful. Best regards.