True, they have collected data from people with and without the flu virus
The therapy for anxiety disorder is called as cognitive behavioral therapy and is used to treat various phobias, panic attacks, social anxiety etc. Cognitive therapy is the assessment of negative thoughts contributing to anxiety. Behavioral therapy is the observation of the reaction of the person towards these thoughts. Medications for the same includes serotonin reuptake inhibitors.
The biggest role would be the Brain.
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i dont have the article so i cant really answer, but id assume switching it from prescriptions to over-the-counter will make them cheaper because you dont have to see a doctor to get them.