I haven't found any positivity spells but I have found some positive affirmations that you can say to yourself continuously every day. Doesn't even matter if you don't believe the words or not at first, just keep saying them so that your subconscious mind will grasp the postive idea and it will help with the negativity.

"Every day in every way, I am getting better and better."
"I am well. I am whole. I am happy."
"My body, mind, and spirit are filled with healing light and energy."
"The Big Little Book of Magick" by D.J. Conway

Or, you can try meditation with some black onyx, clear quartz, rose quartz, hematite, amethyst, malachite, black obsidian, or pyrite. I recommend the clear quartz since it is a great healing stone and probably the easiest to find. Always think positive, and the moment you feel negativity, just laugh. Laughter also dispels negativity! Blessed be!