your guess could be right coreg might be causing the side effects cough shortness of breath as it tends to increase fluid in lungs also increase triglyceride part of cholesterol and increased urine frequency mostly tiredness is both from Coreg and Amlodipine and excessive sleeping could be mostly by Amlodipine so better try decreasing the dose to see if it helps increase Potassium rich diet take multivitamins and minerals and exercise regime to rejuvenate you as you reduce your medication dosages for kidney stones prevention hydrate more and take cranberry juices and other fruits and vegetables that help detoxify kidneys like celery parsley cilantro