This isn't a spell about forgetting, exactly, but it is meant to help you move on with your life. Here it is (it's also in my online BoS
http://everythingunderthemoon.net/forum ... 25423.html):
One Big Thing Spell
This is a spell that is designed to help you overcome that one big thing that is just weighing you down and keeping you from moving on in your life.
Requirements
~a white balloon with a string attached to it (helium works best, but one blown up by mouth will do.)
~a felt-tip pen
~four sticks of incense (preferably all in the same scent and in one that brings comfort and peace to you.)
The Spell
Take the balloon and incense to a nice open space outdoors, like your yard or a nearby park. Close your eyes and let yourself feel the magical energies that flow around you. Let them flow into you, raising and enhancing your power. Light the sticks of incense as you cast the spell. Begin by turning to the North and saying:
Guardians of the North,
Powers of Earth, powers of clarity,
Make this spell a reality
Push one stick of incense into the ground and light it. Then turn to the East and say:
Guardians of the East,
Powers of Air, powers of thought,
Make this spell work as sought.
Push another stick into the ground and light it. Then turn to the South and say:
Guardians of the South,
Powers of Fire, powers of energy,
Makes this spell work immediately.
Push the third stick into the ground and light it. Then turn to the West and say:
Guardians of the West,
Powers of Water, powers of emotion,
Put this spell into motion.
Push the last stick into the ground, light it, and grasp the balloon by the string.
Stand in the center of the space that you have defined with the sticks, holding the balloon. Concentrate on releasing your issue with the balloon. Hold it up, and let go of the string. Watch the balloon take flight, and visualize the burden that you have been carrying soaring away from you. You should feel uplifted and relieved as the balloon moves away from you. Don't worry if it pops, that's ok.
Remain in the center until the incense burns down, and then clean up.
Afterward
Whenever something reminds you of your one big thing, recall the sight of that balloon sailing away from you. Remember that this thing no longer has anything to do with you, and rejoice in the freedom from it.