I am 67, a woman and have myasthenia gravis. I was shoveling front walk and afterwards felt pain in my chest, light-headedness and nausea. I laid down for awhile. I have been on prednisone long term (since 2007). Only on 5 mg ED now due to adrenal suppression. But have been as high as 70 mg everyday. The last time I experienced exacerbation I had to go back up to 40 mg ED. That was last spring. I guess I am concerned about my heart. I took my blood pressure and it was 145/73 with pulse at 87. November 2016 my total cholesterol was 311, HDL 85, TRG 142, LDL 197, non HDL 225, LDL/HDL 2.3