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.