Mindfulness, Biofeedback and Relaxation Therapy have all been shown effective in treating anxiety.
Anxiety symptoms include increased heart rate, high blood pressure, shakiness, nausea, sweaty palms, and several gastrointestinal difficulties, along with many other physical and cognitive issues.
However, it can also cause mental fogginess, difficulty making decisions or concentrating, poor memory, skin rashes, and can exacerbate other issues such as chronic pain or headaches, as well as disrupt your sleep.
Heart Rate Variability is one biofeedback technique found very successful in eliminating anxiety.
Many studies conducted over 50 years have determined a high heart rate variability is associated with better emotional and physical health.
You can learn how to improve your HRV through biofeedback at Change Your Mind: Center for Brain-Body Wellness.