The most modern way of dealing with anxiety is exposure and acceptance. Most of the time if not all of the time anxiety is a form of OCD, or obsessive thinking. Reassurances don’t quiet or calm an anxious mind they just pose opportunity for “that scary voice” to argue back with vengeance. When one accepts the fact that it is ok to feel afraid despite it being uncomfortable it is then possible to face fears head on. Full exposure to scenarios or thoughts that would normally produce high anxiety for periods of time will condition the body to normal response.
People that are anxious by nature will probably always have a tendency towards anxiety. Learning to accept it and cope with it is key to leading a life untethered to fears.
Bitachon is a belief, an actual cognitive thought process. Anxiety is very real and most times physical. It can be caused by chemical imbalances or times of high stress. There are times that a person can feel anxious without even knowing what they’re anxious about. Physical reactions are not controlled by logic. That’s like talking yourself out of a fever.