What can stop my constant production of thick heavy phlegm?

[issiah53]

For 2 years now I have been inflicted with a condition I need help with. I have a continuing buildup of thick heavy phlegm which I have extreme difficulty coughing up even using Mucinex. It goes on all day and all night. I am getting little to no sleep and am wearing down. I have gone to numerous Doctors and emergency room visits. They just give me more prescriptions for antibiotics and different steroidal inhalers and have also told me to use Mucinex. But the Phlegm is so thick and sticky it can take hours of constant coughing to get something up. Please can anyone help me? I don't know how long I can continue this.