Having a bad cough

I have been coughing since a very long time, now over a year. The last three days it has gotten a lot worse, with very deep coughs and frequent coughing.

Coughing for a long time is very tedious

I went to the doctor who made some tests, but said its just some kind of infection in the body. Still last night I was coughing so much so that I couldn't sleep and had to go and try to sleep on the sofa so I wouldn't disturb my wife. As I have coughed hard several days now it hurts in the throat.

Seems impossible to find something that helps against coughing.

I have tried several medicines and drinking a lot of warm beverage. Nothing seems to help.