I have a enlarged heart, I am diabetic, I have really high blood pressure, and was told I have angina. I have a very hard time breathing when I lay down. Sometimes so bad, I wake up covered in sweat and feel like im gasping for air, and it's not hot, so I know im not sweating because of that....what could it be? Im supposed to have a stress test done, and the heart test to check for blockage...im 23 years old.