Oh, where to start ...
Take a mirror ( hand-held or travel-size ), rub sea salt around it, and keep it on your person.
If you feel an "attack" coming on, look into the mirror, and imagine the negative energy going into it.
If you want to be aggressive, you can then imagine the negative being reflected, and going back to the person who created it.
You can smudge your home, with sage, either loose or in a stick/wand form.
You can take a black and/or white candle, dab it 4 times with olive oil, lit it, and then let it burn down/out depending on the type.
When sleeping, place a jar or votive candle ( black or white ), at the window. Dab it 4 times with olive oil, then let it burn down/out.
~ Never Lost