I am not familiar with vibralung, but I do use a percussion vest. I was not able to cough up hardly anything either until my pulmonologist prescribed this vest. I use it along with my nebulizing treatments and now am able to clear my lungs better. I don't know with your condition if you are a candidate for this but it is very helpful. My Medicare covered the cost except for a low monthly fee I pay for 13 months and then it is considered mine. Good luck to you.