Anyone's breathing became worse after taking Singulair?

I have the following situation. I got abad sinus infection and my doc also suspected that I might have asthma because I was wheezing alot. So he put me on 10 days of Amoxicillin to kill the infection, gave a steroid nasal spray and also put me on Singulair. I have the following symptoms. 1. I have a horrible aftertaste in my mouth especially when I cough..it takes like metal or blood. 2. My breathing becomes really horrible in the evenings (right before bed). I wheeze a lot and loud. Lots worse than it was when I first went to the doc. I do not know if there is a connection, but I wonder if what causes the breathing wheezing problem might be either Singulair or the nasal spray. Any ideas? has anybody experienced the same? I stopeed amoxicillin today. So I can narrow it down to either spray or Singulair that is causeing this. Please let me know if somebody experienced the same problems, or know what is going on. P.S. I have been on all this meds 10 days only so far. Thanks