Phentermine belongs to the group of medicines known as appetite suppressants. Agitated state (very nervous or anxious) or; Arrhythmias (abnormal heart rhythms), Heart or blood vessel disease (eg, coronary artery disease), history of or. Stress has a pretty significant effect on people with Addison's disease. Addison's disease causes a shortage of cortisol, which is a hormone a991.infog: phentermine. Millions of people suffer from constant fatigue and stress that is not relieved by rest phentermine and ephedra, and stimulating medical drugs whip the adrenals. . are only taught to look for extreme adrenal malfunction — Addison's disease.