Normally when someone comes in contact with a demon source yes they first feel it in the pit of their stomach for the human spirits is one of the best spirit detectors ever created... And when the average person comes within 300-500 feet of a demonic source their spirit starts reacting from the...
If you do have a book of spells then my question to you is why do you feel helpless..... For if they are after your book then there has to be something in that book that will help you fight back.............. Or is what you are saying a big lie.................