I agree with the previous poster, can I also mention how important even though hard, it is to get up and move about as much as possible....laying in bed will worsen the fluid and mucous build up....and can lead to pneumonia if not careful. Also a green color can(does) indicate infection....very important to get this checked out asap.
good luck♥
First off, you need to raise the head of the bed with blocks a few inches. You also need to see a gastro doctor to make sure that your reflux is being treated properly. And, yes, this can cause some mucus problems. Hopefully, you're not smoking, as you know that can cause major mucus problems, too.
It is very very important for your sleep apnea to be treated. They usually put people with sleep apnea on a CPAP machine. All of those episodes of apnea can cause your blood pressure to go very high and cause your heart rate to increase big time. This really can be dangerous. You'll feel a whole lot better once these apnea episodes are stopped.
Good luck to you.