Do I believe witchcraft exists ? Depends on what you mean by that. I'm aware some are witches by religion. Do I think there is some kind of unexplained control on others, well I like to keep an open mind but generally no. Certainly not like those weaving horror tales like to spin. This is almost certainly just in your mind. Your subconscious, for whatever reason, is calmer when you do something than when you don't, in this case playing this recording. if it works for you then fine, but I'd not put any more effect on it than that. The mind is a lot more complex than most give it credit for the fact that most think the conscious is in control is just one simple example. This voodoo stuff is likely to cease to cause symptoms with you in time, quran recording or not.