One of my favorite acronyms is for the word fear --False Evidence Appearing Real. Fear is one of the most powerful weapons the enemy can use against us. As believers we are called to only fear God. The fear in that context is a reverential awe not a stark raving terror. Fear works against in terrible ways. It makes us sick in body and soul. Fear is based in our belief of a bad outcome in a certain situation. The situation can involve pretty much anything but health, finances, job, and family seem to be the ones that really hit home. When developed to an extreme fear can lead to crippling phobias. Fear can also be an extremely tough thing to battle.
But "The weapons of our warfare are not carnal but mighty in God for pulling down strongholds, casting down arguments and every high thing that exalts itself against the knowledge of God, bringing every thought into captivity to the obedience of Christ" (2nd Corinthians 4-5). The weapons of our warfare are not carnal (natural) but they are MIGHTY! Take a close look at this passage and discern the argument Paul is making. Pulling down strongholds; casting down arguments; and everything that exalts itself against the knowledge of God and bringing thoughts (all of them) into captivity to the obedience of Christ. The battlefield here is the mind. Satan doesn't show up with his pitchfork, rather, he whispers in your head.
Meditating on a dread outcome is giving in to fear -- believing that "false evidence appearing real." Taking those thoughts captive changes the picture! To do that though we have to something else to stand on. To cast down an argument we have to have something to counter that argument with. How about the Word of God! The Word of God is full of wonderful promises for God's children but you won't know too many of them unless you get in there and dig them out!
How does this work? Let's say you are given a difficult task at work. You might start having negative thoughts like, "There's no way I can do this" or "This is just way too hard. I can't believe I got stuck with this." If you know the the Word that says, "I can do all things through Christ who strengthens me" (Philippians 4:13) then you can cast down those thoughts and bring them into captivity to the obedience of Christ. It is pretty simple but it does takes little discipline and perseverance. You can do it.
Don't let F.E.A.R. have its way in your life!