Take captive every thought and make it obedient to God 2Corinthians10:5 everyone has random thoughts-Jesus was tempted(Satan's lies) but he did not sin.thoughts are not sin-it's our choice what we do with them.Look up promises from God and truths of God in scripture.when the negative thought comes decide not to focus on Satan's lies and replace with scripture. It isn't easy,pray and ask God to help you and find a friend to talk to that will encourage you.
abbymarie