Anxiety:
Anxiety is a feeling of unrealistic fear, worry, & uneasiness usually generalized and unfocused. It is often accompanied by restlessness, fatigue, problems in concentration, and muscular tension. Anxiety is not considered to be a normal reaction to a perceived stressor although many feel it occasionally.

When anxiety becomes overwhelming and distressing to the sufferer, it may fall under the psychiatric diagnosis of anxiety disorder.

Depression:
Depression is a state of low mood and aversion to activity that can affect a person’s thoughts, behavior, feelings and sense of well-being.

Depressed people may feel sad, anxious, hopeless, worried, helpless, worthless, guilty, irritable, hurt, or restless. They may lose interest in activities that once were pleasurable, experience loss of appetite or overeating, have problems concentrating, remembering details, or making decisions, and may contemplate or attempt suicide.

Treatment for Depression and Anxiety Disorders:

Depression and an anxiety disorder can be treated similarly.
Treatment options available:

Psychotherapy:
• Cognitive-Behavioral therapy (CBT)
• Interpersonal therapy
• Problem-solving therapy

Medications:
• Selective serotonin reuptake inhibitors (SSRIs)
• Serotonin norepinephrine reuptake inhibitors (SNRIs)

Cognitive Dysfunction:
Cognitive disorders are a category of mental health disorders that primarily affect learning, memory, perception, and problem solving, and include amnesia, dementia, and delirium. While anxiety disorders, mood disorders, and psychotic disorders can also have an effect on cognitive and memory functions.

Symptoms of mild cognitive impairment (MCI) are often vague and include the following:

• Memory loss
• Language disturbance (eg, difficulty in finding words)
• Attention deficit (eg, difficulty in following or focusing on conversations)
• Deterioration in visuospatial skills