If it is not stress, excitement, or pain related - you better find a doctor that knows about adrenal cortex disorders. Sadly many self professed endo's don't know their business. Find one that does. Some regular family practicioners and internists don't either. You must find a good doc and get this checked.
Elevated levels of catacholamines that are not related to the simple things stress, excitement, pain, or exertion may be from heart problems (heart failure causes an increase in these
hormone levels). There is also pheochromocytoma - elevation of the adrenal hormones caused by chromaffin cell tumor disease. These are not common problems but the risk is not to be taken lightly - GO SEE A GOOD DOCTOR AND GET IT CHECKED.