Last night scare

I was scared to death last night. It was 12:40 and we were working on getting Ansh to sleep. For some reason he did not want to. So we keep on trying. We had given him his night dose of cough medicine and tylenol as he got his shots day before yesterday and was running close to 100 degree temperature. Shalu sang him some lullybies and then I did and he finnaly slept. I transfered him to his crib and off we go to sleep. Within 5 mins, Ansh started to cry like crazy. We had never heard him cry like this before. Shalu got scared first. I did not. But then when he did not stop, even I got scared. It was like he was choking or some thing. His face was all red and he was crying on top of his voice. I thought may some thing bit him in the crib or went into his mouth !! I had no idea what to think of? I am one of those who believe that there always a reason behind everything. Even if not, I try to find it hard but when I fail, I accept that may be there is no reason for this particular thing. But definitely there was some reason why Ansh cried like that and I feel horrible accepting the fact that I have no idea what the reason was and the fact that probably I will never be able to find it.