Suggest Treatment For Long Lasting Cough That Ends Up In Vomiting

Symptoms: Persistent cough since April 2014 that does not respond to antibiotics or cough meds. I cough until I become nauseated and vomit. No temperature. History: I am being treated by the COH for a Bone Marrow Transplant I underwent in Sept 2013. I was placed on a number of medications including a couple of Steroids, Anti Viral, Anti Fungal, and Anti Rejection Meds. My body did well accepting the transplants with few complications until they started weening me off the meds. After removing from one of the Steroids (Prednisone) and both Anti Rejection drugs I started feeling shortness of breath and overall weakness. A Scan showed I had suffered Congested heart failure. They started me on Cardisolol (heart med) and changed my blood pressure meds from Amlodipine and Atenolol to Hydrochlorothiazide and Lisopril. I developed a persistent cough (which I still have) and blood pressure started going too low so they changed the Lisopril to Losartan. This cough doesn t happen all the time but, when it does it last so long I become nauseate and vomit. Prior to coughing I spit up this foamy, sticky phlegm. Cough medications do not help. Happens mostly when I laying down. Recent chest x-ray was clear.