Welcome to HCM,
You are having Hypertension
and presume well controlled by drugs which you are taking Lisnopril and Hydrochlorothazide.
sodium which is leukotriene inhibitor but is not commonly used just for cold
, It has no effect on blood pressure.But OTC cold medicines can increase blood pressure hence should not be taken by Hypertensive patients.
please do not take any such medicine by yourself.
If you are having mucus which is difficult to bring out ,Visit Physician and after proper examination Mucolytic( Acetylcysteine
),expectorants may be given to help you and even inhalation of steam would make it easier to expectorate.
If there is infection then antibiotics may be required.
Please take care