Symptoms presumed to be related to autonomic overactivity include the following:** Palpitations 75% (Grubb, 2000) Tremulousness 37.5% (Low, Opffer-Gehrking, Textor, Benarroch, Shen, Schondorf, Suarez & Rummans, 1995) Shortness of breath 27.6 % (Grubb, 2000) Chest discomfort and/or pain 24.3 % (Grubb, 2000) from the dinet page