best spell is a way of life... rituals are only symbolic and energetic trigger for that energies, but you are the one that wield those powers, ''spells'' are just a way to manifest your will. if your will is strong enough, no ritual, chanting or mantra is needed. bend your energies to your will, and use you heart and mind to live in a way to attract or repel things that happen around you. in this case, best thing to do is to take pure frankincense, and burn it on part of coal, then take pure white paper and put it over the smoke visualising all negative and dark energies are leaving you, trough that coal into the smoke and being trapped on that paper, and make sign of cross over the coal. then take that paper, and throw it into the running water (river for example). rest is up to you, forget about darkness that has been tormenting you, thing and act positive, change your attitude and know that this worked, and you will have no doubt when you become aware that its not this ritual alone that wields the power, but you do.