Following screening the participant will return within 1-3 weeks to have brain scanning done which involves both functional (resting state) and structural scans. The investigators will measure changes in the autonomic nervous system simultaneously through electrodes on finger tips which measure minute changes in sweat glands. Saliva samples will be collected for analysis of polymorphism in genes controlling inflammation, pain, and nerve functioning. Prior to the scanning the participant will be asked to complete questionnaires to assess current (state) mood and symptoms on Survey Monkey.