As my doctor (pulmonologist)said that I have bronchi related issues and prescribed me seriflo-250. Before I was having dry cough for around a month. After using it 2 times I'm coughing much more than before along with sputum and all of a sudden I have a runny nose too. I've also got a mild headache and a fever of about 100 degrees(f).should I be worried or the medicine is only doing it's work. And I had a smoking history of 3 years. Now the coughs are more frequent and deep than earlier.