Thanks so much for your reply. Wow Melanie, its scary to think about these reactions that they could possibly get!

Well, I am now wondering if it's something else, because tonight, he screamed the house down, and has been arching his back when I lie him down. The last few days, if I have been able to pat him to sleep, it has only been on his side, and tonight, I could only rock him to sleep, but not horizontally.

Would this be something like silent reflux? Done a bit of search and it sounds a little bit like it.