Singulair Sperm, Strong Suspicion, Have Heard That, Motility, Ivf

Not sure, but strong suspicion. I am 33 yrs old, have been on singulair for five years and found out last year that the majority of my sperm are either dead or close to it..
I don't know if singulair is the cause but I have heard that it affects the motility of the sperm. Luckily, with the help of ivf, my wife and I were able to conceive..this drug was prescribed to me for hives and now that i am on it I can't seem to get off. Every time I stop taking it, I feel like I can't breathe and that my chest is closing up. I have never had allergies or asthma, but now it seems I am dependent on this drug..
If anyone has heard or read anything about the effects of singulair on reproduction, please post it here to let me and others know...thanks...