What Causes Constant Cough With Mucus When Diagnosed With Asthmatic Bronchitis?

Question : I am 55 years old. At birth I was diagnosed with Asthmatic Bronchitis. I was put on allergy shots which had no lasting affects.
I am not allergic to any items per my last test.
My problem is that for 55 years I cough clear, thick mucus out of my lungs. I do not smoke.
This may sound strange but the last doctor I went to did all the test regiments and I sampled about 30 medicines that had no effects. He said I was the worst case he had ever seen and said he had one last option. He sprayed liquid cocaine in my nose and it cleared me up. He was going to write a prescription but I did not want to become an addict.
Presently I live a normal life. I cannot go run a marathon but live well except the agrivation of the constant coughing up mucus. It ceases at night while sleeping but resumes all day.
Do I have an infection that never healed? Is there any medicine on the market now that will eliminate the excess mucus?
I would like to find something without side effects. One medicine I took caused my eyesight to make me wear reading glasses the first time I took it.
I appreciate your imput.

Would I have to take the medicine all the time or will it resolve the issue short term?
It seems like the mucus faucet never turns off during the day but does at night.

Thanks, I ordered it