I Have A Cough That Has Continued For Over A

I have a cough that has continued for over a year. My doctor tells me I have asthma and I have
allergies, heart disease, diabetes, high blood pressure. We have tried numerous inhalers which give me temporary relief. I have been to ENT, who diagnosed Acid Reflux. Prescribed Omeprazole, which made no difference. My dr. is at a loss and thinks I need to start with my heart dr. Very frustrated.......