I Have Taken NyQuil Long Term To Help Me Sleep.

I have taken NyQuil long term to help me sleep. Today at work I had horrible coughing at work and my bp was 190/135. They gave me clonodine at the urgent care center and got my Bp down to 140/100. My chest X-ray, cmp and ekg were good...no issues. I am on a prednisone taper for suspected reactive bronchitis as well as guiafenesin with codeine. I am in bed and feel anxious and my bhp is still elevated. Could long term NyQuil usage be the culprit and if so how long until it is out of my system