How to tell you are under spiritaul attack

That has been something that I have struggled to differentiate from just plain ole' human existence.  It has been a rough week mentally and spiritually and I am just not sure which way to go. I am getting so frustrated with school and have this, "I don't care attitude" about the whole thing. I need to spend more time in prayer with the Lord, and ask for renewal of spirit and mind. I am tired.