Hmm I partially disagree with this advice.  If OP is indeed being attacked by something from the non-material realm, then it would make sense to use a similar protection device against it.  An entity made of "mind-stuff" cannot be countered with physical stuff, only with other "mind-stuff".  SWIM has had good results using the Bible against these sorts of entities (specifically evil "spirits" haunting a place), calling upon Christ and all that stuff.  Even though the Bible has been used to justify all sorts of bad actions, inquisitions, etc., there's still a lot of light and a lot of power in it. 

Also, from what I know about shamanic traditions, they typically advise people to go to an MD first, before consulting the wizard, but if the Western route fails they then send the person to the shaman.  Hope this helps, good luck.