Had Sinus Infection Dr Prescribed Bactrian Antibiotic. Weez Cough Started

Had sinus infection Dr prescribed Bactrian antibiotic. weez cough started week later prescribed benzonatate for cough & 5 day steroid. 4 days later cough & weez is back loosing weight during whole time hard to sleep feel lifeless not feeling energy sometime. right now drinking fennel tea stomach a little upset I do not take any medications.I left message with Dr voice mail. I was thinking about taking NyQuil cold & flu nighttime relief
To sleep what do you recommend?