Sure, but remember that both Pulmozyme and GSH are helping to thin mucus. It may simply be that for your body's system, at your age, that's too much. However, GSH cannot make you bleed. It can, however, increase the amount of blood that you do bleed, because it is a vasodilator.

As for the shortness of breath, I suspect an alteration of your PGE2 levels . . . All that having been said, if you are not experiencing positive benefits, and think you are experiencing adverse effects, then by all means stop.