Everyone is different is an oft used phrase but so true. My secretions were thick and uncomfortable four weeks post treatment before changing. I still deal with mucous but much thinner and more in sinus cavity. Once the mucous does dissipate next is usually dry mouth which is equally unpleasant. I get concerned looking at the amount of Fentanyl he is using. what have the doctors recommended to decrease the amount? Have you asked them if his symptoms are in anyway related to narcotics? For the most part I was reliant on the PEG through week 10. Mine was due to an ulcer from RAD on my tongue that made eating painful. I am just now eating more and more each day. I began weaning off pain meds 4 weeks ago and now take 1 5mg Oxy every 36 hours. The weaning was well planned out and this week the 1 tablet goes and Motrin will be used as needed. Narcotics cloud issues and progress. Talk to the Doctors and put a plan together. That will make a difference.