Hi thanks for asking question . Here are few possibilities. Cough fits are because of some sore in respiratory tract. First it can be because of bacterial infection like pertussis or other form of pneumonia.chest x ray done for consolidation. Second if associated low grade fever present possibilities of tuberculosis must be ruled out. Thirdly chronic obstructive pulmonary disease might be cause particularly acute bronchitis cases.pulmonary function test and x ray helpful in diagnosis. Fourth last one if abdominal pain present and heart burn like symptoms present it can be because of acid reflux. I hope my concern helpful for you in approaching in your case