I was on Singulair for approx 3 years with zero side effects other than actually being healthy for the first time in my life - no chronic acute bronchitis episodes, no calling in sick to work. Then I switched jobs and HMOs - they immediately took me off of my Singulair and Combivent and put me on Qvar and Proair. Quess what? I began wheezing and sniffling. So they prescribed Claritin and Nasarel on top of the other two. Still not working. So now after a bout with antibiotics and steroids they have prescribed Flonase and over the counter Zyrtec. I have BEGGED to go back on Singulair repeatedly. I have offered to pay the $120/month out of pocket. Now I really am depressed and angry all the time - as well as having intense headaches, tremors, chest pain, insomnia, jitteryness then fatigue then jitteryness again = all because I can't get the stupid Singulair.