Time is Crucial

Time is crucial to heal the anxiety with Zhan Zhuang. The body channels can be opened with this standing mediation by doing it daily from three weeks to three years.
Sometimes the blocked energy channels (neural pathways) can be so due to mechanical factors. This makes the healing time longer. So the supplemental exercises can accelerate healing by relieving mechanical pressures on certain nerves. The supplementary exercises like hiatal pressure relieving, massaging of abdominal area, gut smashing etc. could help to heal faster.

Sometimes when playing hard sports a small dislocation of the stomach can happen like volvulus of stomach, gastroptosia etc. These can cause anxiety, too! Download this book Qigong for Health

This exercise from the book may have very good effects by producing chi or dc body electric field.

Lie on the back. Rub the abdomen with the left palm from the left to the
right and then from the right to the left, 10 times respectively. Then change the
right hand to do the same for another 10 times respectively. Rub slowly at first
then quickly, and then slowly again. Repeat for 10 minutes. (from  Qigong for Health)

Zhan Zhuang is a core exercises in the above book.

The potential energy can be discharged into kinetic energy - Fali

During Zhan Zhuang or static stance, the internal nervous energy is increased and circulates in the body. As known wherever there is tension in the body mean that there is a blockage. By putting awareness into the tension area (muscles) and relaxing it through breathing, the tensed areas becomes relaxed and nervous energy circulates freely. However, there is a school of thought, that the relaxation comes itself automatically without the need of mind but simply by just standing for long periods.

The somatic symptoms of anxiety are thought to be accumulated nervous energy somewhere which is being discharged through somatic symptoms (taking the role of a valve). This negative nervous energy (arousal from fear) can be turned into positive energy (comfortable) through relaxation which is a by product of Zhan Zhuang.

In Yiquan, the Fali is the technique in which the energy can be discharged when we go from a total relaxed body to a fast moving punch that comes from contraction of the whole body just as you fight toward the threat.