G'day!

You really need to finish the book, and then determine these things for yourself.

If you are getting angry for no reason, feeling drained, and feeling a sensed presence around you, it is quite possible you are experiencing neg interference.

If these are the only things you are experiencing, it does not sound bad and the countermeasures in the book, and given below, should help.

The following link has articles relating to neg countermeasures. The top 5 are fairly new, so I suggest you read them.

http://www.astraldynamics.com/tutorials/?BoardID=10

Take care, Robert