I had my asthma under control, avoiding anything that would cause problems, not medicines etc... until recently I had a bronchial spasm from a traumatic experience. After an ER visit I now have an inhaler and was prescribed Singulair. For someone who knows their body who has never really taking nothing, now I was taking Singulair. Singulair singled out my life and gave me a horrible life. I thought I was going to die because I felt like it. I thought I could be coming down with the flu or something. It made me feel very down and out leaving a yucky feeling. The normal activities I once enjoyed doing, that joy was gone. Insomnia set in after taking this medicine for the past 8 weeks now. As of yesterday after hearing reports of the disturbing side effects, I'm off of Singulair. I will have to resort to something else, because I want my life back.