Has anyone used singulair and found it their condition worse?

I was on singulair since at least May. I've wanted to come off it since 8 weeks into it, but my gp wouldn't do. My consultant has taken me off of it and my condition has picked up, or at least it feels like it. My peak flow is a little lower than it was while I was on the singulair but I'm not coughing as much as I was, I feel like I'm properly clearing my chest. I haven't had any attacks since coming off of it and I was having them regularly.

Has anyone used it before and found their condition worsened whilst on it?

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Singulair made no difference whatsoever to my asthma. Gave me awful nightmares so bad I wanted to stay up at night and not go to bed. Accolate, ditto.