It s certainly not because hinduism is a bad religion. Simply my body is adjusting to new vibrations I have never heard much before. Like a shiatsu massage after having drunk the night before. (Sure way to be ill by the way from shiatsu). I had the exact same sickly feeling for a while when I visited tibetan temples in toronto after I thought ESL to tibetan nuns in india. This is usually a GOOD sign, everyone, about what you are listening to in religious chanting.