What Causes Shortness Of Breath And Cramps In Legs And Feet?

Resutls of stress test explained. EKG: Sinus bradycardia, PRWP small Q s 11, 111, AVF. Baseline heart 55, w/vasodilation 80, BP 140/68 w & without dilation. Conclusion all normal. I have a stent & echo showed hypertrophy left ventricular & mild calcification mitral valve annulus. I take Plavix, asprin 325,Bystolic 10mg. I am 68, female, x smoker for 4 years, 170, 5 6 . I get out of breath with stairs or any prolonged activity. I also have PAD. My feet & legs cramp & are always cold. My cholestrol 210. I stopped crestor because of leg cramps. My question is, is Bystolic too strong?