You mentioned finding it easy to let go of your fear of the unknown by realizing that you do NOT truly know "their" motives.
Keep this thought in your heart friend, and listen. I am nobody and know nothing, but I honestly think that if you continue to remain calm, and accept the "unnatural" nature of this occurence, things will calm down a bit for you. I honestly believe this.
On the other hand, if it is infact a "demon", know that you are not alone, and if a dark side exists, most certainly a light side does as well, and the universe will not allow for anything to go unbalanced. So rest, and be at peace child.