I have a cough that is consistent and at time cough so hard I throw up. My throat is itchy as well. Went to the Doctor about 2 weeks ago and whopping cough test was negative. Was given an inhaler and antibiotics and it stopped. It has now started again. I found that my portable ac unit had water inside and has probably been there since I used it last which was a year ago. Plus I did not have it hooked up correctly so the air was blowing inside the room. Could this be the cause?
You could be suffering from cough variant asthma and trigger could be as you have said the stale water in your portable ac. There must be molds and spores of these molds may have triggered the attack. You should take inhalers like Stalin, Aeroflot. Montair tablet and if required, a short course of oral steroids. Frequently change your bed linen and sun your mattress and pillow frequently. Your room should also have fresh air ventilation.