I had (and still have ) this problem with the foamy muscus that you are talking about. I had EC surgery in 04 and mine is related to reflux. I don't have it everyday, but sometimes if my system is not just right it will happen in the middle of the night or if I don't elevate myself enough when I sleep I will asperate (I know thats not spelled correctly) and if I do the foamy mucus will be very heavy. Other than this problem, I am getting along just fine. I do take Previcid every morning for indigestion. Talk to your doctor about this, but it can be a minor, however a very agravating problem.
God bless you and Happy, Healty New Year!!!!!
Gerri