Since 1 month my father is facing a problem of panic attack, intolerance towards high noises and volumes in any surrounding. Whenever he faces such things his BP shoots up and reduces his ability of thinking efficiently. It also feels like stopping of heart beat. Usually he takes BP medicines but I think that is not going to help for long. Doctor gave nortriptyline but after intake of just 1 tablet he feels fatigue and little difficulty to stand up properly. I am worried if this medicine is right for him after seeing these symptoms? Please help