question: I am a white female, 55 yrs old, mild diabetic, controlled with diet, exercise and metformin, 1,000 mg twice day. I am 5 7 , 180 lbs, I have been walking a mile to 2 a day about 4 days a week minimal. I have begun having rapid heart rate, tachycardia, upon exertion. I don t break out in a sweat or get nauseated, haven t really had arm or shoulder pain, but I do get tight in my chest, and minor shortness of breath. I can sit, and it goes away, until I exert again. I have minor medical knowledge, and know to get to ER if this gets worse and report to the doctor, but...was just wondering...do I need to go sooner than later?