Chronic cough

Shalom rav,
I don't have Hebrew fonts on my computer but you can reply in Hebrew - thanks
I've had persistent cough for 6 months which started after the cold.
Lung Ct was OK and sinuses CT said that I have 'severe sinusitis in most of the sinuses'
I was prescribed prednisolone twice for 2 weeks each time, when I took it the cough stopped and when I finished
- it came back gradually. I wake up every night countless number of times because of this cough.
Is there anything that can be done?

Toda raba