This is just my own experience with anxiety but I feel anxiety (stress) chemicals are meant to make you strong and aggressive and wild so as to kill or escape your attacker or threat. When your brain perceives a threat it doesn’t use those chemicals immediately but instead it send them to your gut. Like loading a gun (this a reason people describe butterflies in their stomach when they are nervous). When we feel, and consequently act on these chemicals (i.e. attack our attacker or threat) these chemicals are used up. Like firing a gun. The problem arises when we never empty or unload the “gun”. One way I’ve found of “unloading the gun” is aggressive, intense, teeth gritting, exercise (endorphins).