While a storm, gather a bottle of rainwater and keep it for this purpose. A bible should be put on its bottleneck. Get down on your knees and open the bible and without choosing just pick a passage and read it while maintaining the bible on the neck of the bottle. Continue until you get tired, really tired. You should try to feel the negativity pass from your body to your arms and further out to your hands, to the bottle of water. When you have finished leave the bible there on the neck of the bottle until the next day. Then pour out the water on the base of a tree but not a fruit tree. It could be done several times.
The travel of your inward negativity, from you through the Holy Scriptures, then to the water and the tree is a token of your purification.