It is expected that adding ASTM to TAU will be better than TAU in improving HRV, depression severity and other autonomic parameters in the treatment of LLD. It is expected that this intervention will produce significant anxiolytic and enhanced quality of life outcomes and will have no major side effects. If the results of this study are positive, it is possible that this intervention could be considered as treatment option for the management of this disabling illness in primary, secondary and tertiary care. Such treatment option would be more cost and staff effective, and self empowering than the current standard of care. It could also provide treatment options for patients who are currently resistant to their antidepressants.