Lots of new diagnoses

I'm a 75-year old woman, overweight, with long-term controlled HBP (using Candasartan 16mg).  This spring I asked my primary care doc about a slowly increasing amount of breathlessness.  To make a long story short, various tests have revealed left bundle branch blockage, heart murmur, and coronary artery disease. The cardiologist says that there is no need at this time for a stent, no urgency about the lbbb or heart murmur and he doubled the candasartan and added Crestor (20mg) and I don't need to see him for six months.  That's good news, I guess!  I'm still breathless and suddenly feeling older and more tired and worried about the future.  Thoughts?  Thanks!