I probably would reduce the concentration of lemon oil to 15-20 drops in 30 ml having had colleagues who have had clients with a bad reaction from that sort of concentration. Never had a bad reaction to it from my own clients though.
Please check that this widget Facebook Reviews has a connected Facebook.
Facebook API Error: {"error":{"message":"Error validating access token: The user has not authorized application 1501100486852897.","type":"OAuthException","code":190,"error_subcode":458,"fbtrace_id":"Add3Ud4E-T7Zg7mj-x4lgUY"}} Reconnecting to Facebook may fix the issue.