Don't be afraid to do the following spell if you ever feel uneasy or like you might be in danger. Anyway, here's the spell. Visualize white energy in and around yourself. Now hold this visualization while affirming "the white energy is protecting me". Affirm 5-10 times.
White energy reflects and repels. Always use white for protection spells. This can come handy if you know an enemy mage who you think is causing you harm. In cases like that, be sure to do the spell every so often to keep it going. This will prevent someone from doing any harm to you by means of magic.