Propranolol for Treating Fibromyalgia Pain

Inclusion Criteria: * Females with fibromyalgia (both meeting 1990 American College of Rheumatology (ACR) FMS criteria and 2010 ACR FMS criteria) age 18-65 with at least 1 year of symptoms and sedentary (exercising less than 120 min per week). Exclusion Criteria: * General Health Criteria: * Uncontrolled/unstable illnesses (physician diagnosed, self-report) * Pregnancy or planning to be pregnant in the next year * Having Asthma requiring medication treatment including inhaler * Type I diabetes or Type II diabetes requiring medical therapy that can lead to hypoglycemia * Having acute pain or neuropathic pain * Participation in exercise or psychological treatment studies in the past 2 years * Having known serious psychopathology: Psychosis, history of inpatient psychiatric admission in the past year, active suicidal intent, history of self-injurious behaviors in the past year, history of recreational IV drug use, substance abuse history in the past year) * Cardiovascular Criteria: * Having known cardiovascular diseases (self-report, physician diagnosed) * Pacemaker * Bradycardia (resting heartrate of less than 55 bpm) * Resting diastolic BP \< 55 mmHG or systolic BP\<100 mmHG * ECG showing prolonged PR interval \> .2 sec * ECG showing irregular PR interval * ECG showing incongruence between P wave and QRS * Medication Criteria * Allergy or intolerance of beta blockers * Current use of the following drugs: * Antihypertensive drugs * Neuroleptics * Monoamine oxidase inhibitors * Tizanidine * Amphetamine-based medications * Bupropion * Mirtazapine * Tricyclics: daily dose greater than 75mg amitriptyline or equivalent * Benzodiazepine: daily dose greater than 5mg diazepam or equivalent * Asthmatic medicine, including inhaler * Participants may be included after minimum of 4 weeks of physician prescribed termination of these drugs