Just this week Ive noticed I am tiring and very short of breath doing normal  physical excursion. After a few minutes of rest and catching my breath I am back to normal. I am a type I diabetic. my last A1C was 6.7. I have been diabetic since I was 19. I am now 54. I am very concerned as this is abnormal. I have a very strange and uncomfortable feeling in my chest accompanied by pain in my shoulder and upper back during these episodes.
Though your Diabetes is under good control one can not ignore the symptom like getting breathless on normal exertion. First get your He % Hemoglobin done,.. Low Hemoglobin can cause such problem. I will advise you to undergo thorough cardiac checkup, B.P., S. lipid profile ECG, Doppler Echo, X-ray Chest pa and Tread mill test/Coronary angiograms. Anginal attacks can cause attacks of breathlessness. Try to get your kidney functions done like B. urea and S.creatininedone. High creatinine can lead to such problem. Lastly rule out respiratory problem like bronchitis.