Fear isn't just what it feels like when you are typically afraid or scared or worried or doubting or anxious or nervous. Fear can be subtle.
Fear is any belief whatsoever that anything other than God's love is real. Fear is any belief whatsoever that it is 'true' that something has gone wrong. Fear is any belief whatsoever that you are separate from God and are not 100% supported by God.
The distortion in your mind that occurs when there is no trust in God, even to a subtle degree, is the same distortion that manifests in larger, more familiar forms, that you would normally label 'fear'. You do not realize that even in your 'better days' of being separate from God, where things seem to be going your way, you are still in a state of fear.
You have to be afraid if you believe you are separate from God, because the belief in separation demands a belief in sin and guilt which leads to fear of punishment and ultimately death. Whether it is in the background of your mind or deeply repressed or blaring in your present awareness, it is still fear.
"All healing is essentially the release from fear". - ACIM/Jesus
Which means, all sickness and all suffering is a form of fear. Even death is really the fear of life.
We do not understand fear when we compartmentalize it and think of it as just an occasional event, intermixed with 'things going ok in the dream'. We will always be afraid until we are One with God.
You also are not really exempt from fear when you are feeling proud of your own separate abilities, or of who 'confident' and assertive you seem to be in social circles as a separate self, or when you are seeming to find answers to problems which really don't solve all problems. You are still afraid on some level.
The only end of fear is when love is present. Which means God.