I just started Singulair 10 days ago and 3 days after I started I...

I just started Singulair 10 days ago and 3 days after I started I developed what I thought was a massive head cold. Pains at the base of my neck, followed by a stuffy head, sore throat, and a nasty cough. This dry, never-ending cough keeps me up at night. It takes over an hour to go to bed even after taking Nyquil and last night I even tried Rx cough syrup w/codeine, still over an hour to get to sleep. I cough to the point of gagging and sweating. This has been happening since last Monday and it's so embarrassing at work. I know people are afraid they are going to catch my "cold" If it were a cold, I would think I would be getting better by now, not worse. This morning I felt so bad that I decided to search the internet and found this post. I beginning to think it's the Singulair. I'm going to the doctor and then depending on what he says, I may try quitting the Singulair. I am miserable. I was reading the other posts and was amazed at the symptoms I've had but had not connected to Singulair yet. I had a vivid, scary dream last night and I don't usually dream much, but this was very real. I also had noticed lately that I keep thinking I see someone coming or passing by out of the corner of my eye, and I read someone's post that referred to shadows in your peripheral and I was shocked! This is exactly what I've been seeing. I would have never blamed it on the drug. I will see how things go once I quit taking it. This is unbelievable!