Hi, welcome to the forum, there may be underlying bronchial asthma or chronic bronchitis. Chronic bronchitis usually presents with sputum (mucus), esp. in early morning. Other important and rare condition to be ruled out is cystic fibrosis wherein there is presence of thick saliva and respiratory secretions. Even rare disorder like Sjogren's syndrome is associated with dryness of mouth and thick saliva.
The other common possibilities are gastro esophageal reflex disease, hyperplastic tonsil, abnormal upper esophageal sphincter function, stress or psychological abnormality causes this sensation due to altered upper esophageal pressure. You may need to undergo endoscopic evaluation, chest radio graph etc..
Firstly I suggest you to consult physician for possible causes and further management. Take care and regards.
Have you discussed laryngeal-pharyngeal reflux with your doctors? That is a form of acid reflux with the main symptom being constant mucous or globus feeling. There will be no heartburn associated with LPR.
I would suggest that you experiment with Zantac or Prilosec, and acid reflux lifestyle changes (diet, elevate the head of your bed 6 inches, don't eat 3 - 4- before going to bed, avoid caffeine) and see if there is any improvement.