Jordan,
Sounds much like our situation. Still after being 8 months out from the end of chemoradiation the thick mucus flows. It was realy bad for the fist six months post treatments and it is just now beginning to ge better. The mucus accumulates in the throat, triggers the gag reflex and causes nausea and vomiting. We have tried different nausea meds (Compozine, Zofran, Ativan) but the meds did not seem to improve the nausea much.
Our ENT told us that the mucus was caused by the irritation in the mouth to the chemoradiation and the destruction of salivary glands that produce thin saliva.
Hang in there as the mucus flow will get better with time.