After having the flu I have a lot of cough in crises ...

Good Afternoon, I'm 34 today, and every time I have an itch, after the symptoms improve and the flu goes away, I start coughing cramps that intensify at night and especially at night. A dry, horrible cough that goes on for hours. I drink syrup, tea, gargle, anti-allergy and to get to sleep, I spray with atrovent, it gives a relief. 2x a day. At work when it comes that unbearable itch, I die of shame, but inevitable, I even have no voice. I no longer have the tonsils, not bad, because they do not ignite, but from 2 years to now almost died of coughing. What can I do to improve this?