I have pvcs and tach. i've had stress tests, echo , ekgs, holters and see a electro. he says benign. how do i get more detailed tests to be sure?

PVC: The test you already did are more than enough. I feel that you are over worried and anxious. Anxiety is a cause of pvcs. I am sure that you are told to avoid excess coffee, smoking, stress, ..

Stress: Pvcs and tacicardia can be uncomfortable, but not necessarily dangerous. Thre are a variety of causes. If these are benign, as your tests indicate, i would recommend a psychological evaluation including psychological tests to determine sources of possible stress. If stress is the culprit, there are a variety of therapy techniques that can help.