Spiritual Warfare

Please pray for peace in my spirit! I believe I'm under an attack from the enemy as I haven't been since I first came to Christ is 1990. I'm not sure what prompted this, but it's really gotten a grip on me! I believe satan has but an evil memory in my mind and to the best of my knowledge it never happened! It just came on me yesterday 3/3/12. I read some Psalms and that helped me sleep last night and I felt at peace in church this AM, but now back at home, I'm struggling again. Thanks in advance for your prayers! To God be the glory!