Suggest Treatment For Cough Associated With Wheezing

I have had a cough associated with wheezing for about four months now. The wheezing is more persistent at night. However the cough comes and goes sometimes producing mucus as well as a metallic taste in the mouth. Over the last 3 to 4 days, I have been woken by a coughing fit that leaves me so short of breath that I can barely breathe. It feels like my chest is caving in. And I have to go and take a walk, get a drink, or if worse comes to worse take the inhaler I was prescribed. I have gone to the doctor multiple times and they still can t seem to make it better. I have not had asthma or allergies my entire life. They gave me an inhaler to use to see if anything got better. It did not. They also gave me a prescription steroid. It made me feel better for about a week or so and then it was back. Please help