Luisa, a follower of Wicca would know that, once a curse is made, the person casting the curse should expct to get misery in return. Most Wiccans avoid negative workings for this reason. Witches who are not Wiccan, however, have no such compunctions and work equally with dark and light energies.
First and foremost, this curse will most likely have only as much power as you give it, so be happy and be well, and thwart the curse.
