Maybe since it is so personal to you, the spell should be written by and come from you. Personally, I think that all you have to do is believe it will work, and when writing it, trust your instincts that it's all coming to you from the right place, giving you the words and knowledge you need.
Also ridding of a problem could be done during the waning moon.
Good luck, I, too, am trying to help someone with a problem:). Have done several spells. PM me if you need a friend.