Try softening your stance, gently relax your face, and allow your muscles to become loose and less tight. Put a hand over your heart with an intention of lovingkindness, and try repeating the following statements with a tone of voice that conveys self-compassion:
May I bear this pain with kindness to myself
May I safely endure this pain
May I accept the circumstances of my life
May I find peace in my heart
May I let go of what I can not control
May I remember that others are also suffering