I Recently Had An Angiogram That Showed That My Lad

I recently had an angiogram that showed that my lad artery was missing. It appeared to the doctors that it had been gone for some time. Testing continued to see if there was life in the quadrant that should have been fed by the lad to see if by pass was option The test showed that quadrant to be dead. My dr called and told me the results and scheduled an echo test in two months. I guess I am unsure if I should be exercising, resting or what activities should be off limits. I was disappointed with my cardiologist as I have only seen her from my initial consult. Should I be asking for a follow up consult to get some direction? I am on xeralta and Crestor now for meds. Are heart attacks more frequent with only 3 quads healthy? What should my greatest concerns?? Thanks for any info you can provide.