After using the rinse this morning I felt as if water was in my left ear. Is there anything I can do to relieve the stuffiness feeling?

Sometimes, if you use too much pressure or blow your nose too hard after rinsing, fluid does drain into the ears through the eustacian tube. If the fluid in the ear is from sinus rinsing, it should disappear, as you have experienced, within a short period of time. If the problem persists, please consult with your physician. You can avoid the problem by squeezing the bottle with less force and blowing your nose very gently after rinsing.