I don't do any necromantic magic either but I was quite shocked when I first experienced those effects. It had something to do with the openness caused by working with the psalms. For me it does not change much, even if there are close family members buried there the effects are always the same. There is some thick highly specific energy all over the place and I can feel it. It gives a rather strange somewhat numb state and there is a feeling similar to being a bit high on something. The energy is very intense.
The worst-case scenario was that I had the taste of soil in my mouth for days after walking there. Fortunately that did not happen again, I changed the practices around and fixed the issues.
A lot more weirdness happened over there. If I light a candle, one of those 24 or 48 hour candles, I feel incoming energy for as long as it's there. The feeling is indescribable, really bizarre. In some cases spirits came into my dreams and spoke of something. One time the keepers came, man in black and woman in white. A weird dream where we spoke about the cemetery effects.