I stopped taking Approx. 1mg of zanzx in 4 pieces per day for 5 months. I stopped because I begin to experience facial sensations between doses, and inflamed sinuses along with becoming jittery. Its been 3 weeks since I stopped cold turkey and I've experienced facial sensations, unsteadiness, sleeplessness ear congestion, and a general feeling of tiredness. These symtoms can last from an hour to 6 hours, then I may have 2 days or so where I feel normal. How long should I expect this to last.