How do you calm the severity of the cough from whooping cough.?

Doctor can check: A cough that persists can be checked by a primary care doctor, even if the patient was already diagnosed with whooping cough. If there is wheezing or lung "tightness", then asthma meds can help. If there is increased phlegm or fevers, the doctor may continue or add antibiotics. If all seems resolving, the residual cough may be treated with the usual otc and prescription cough suppressants.

Cough: Treat it like any other cough with expectorants, decongestants, mucolytics and sometimes steroids. Most of these can be found over the counter.