You won't stop worrying while you think it helps you somehow. Anxious arousal and worry are related but not the same. Anxious arousal is physiological. It is the body's normal reaction to the perception of immediate danger - which can be real or imagined. Worry is psychological and is often just a habit. So, anxious arousal, being physiological, can be stopped physiologically with relaxation, which is the opposite of anxious arousal.

The fight-or-flight response is useful on rare occasions of real danger. Animals respond to external stimuli - a predator, a loud noise which might mean danger. People tend to respond to internal stimuli -  imagined dangers and to socially-conditioned psychological triggers such as  "what will people think of me? etc.

Worrying is never useful. It handicaps and diminishes us. The more it triggers the fight or flight with imagined threats, the more it prevents clear thinking (which is probably our greatest survival asset).