Bless You. It took a while for the sinus and coughing to go away from COVID. The mucous took longer. It's thick clear mucous. I still have it in the back of my throat and I just got over Covid for a 2nd time. Guafenesin (Sp?) helps to thin mucous. I used the sustain release 400 mg from Amazon per my doctor's recommendation. I am not on it now. I drank lots of water and gargled with salt water rinse. I hope this helps. It's a nasty virus my friend. Praying for you to get over this soon.