One thing to remember when you're feeling attacked is that if you have any thoughts or hear any voices saying anything nonsensical, ignore it because it's an attempt to distract or frighten you. If you suddenly get an idea, there's a possibility it wasn't yours especially if when you think about it, self harm could result.
Don't ever think Satan gets mad or over emotional. The gods don't talk like people, and most of the time say nothing at all except through other means of communication. They're incredibly old and far more mature, intelligent and wise. They are very gentle, they don't act obnoxiously and don't want to scare you EVER. Always remember that!
Because the attempts of the enemy are quite pathetic when you see the reoccurring patterns and whatnot. All you have to do is what everyone else said. Simply picture yourself and your surroundings in a raging conflagration, the flames searingly bright and giving off voluminous tendrils of infernal electricity. Hold it for a few minutes and they generally go away. Make sure it's realistic, just memorize the candle flame for reference. Oh, if you ever have nightmares and can go lucid, set the attacker on fire. Most of the time it's a grey.
Good luck and HAIL SATAN!!! HAIL AGARES!!!