Patients who have had COVID and who fulfill criteria for chronic fatigue syndrome will sign IC and be mailed a parasym device with instructions its use after completing entry baseline questionnaires. Subjects will be called two, four and six weeks after beginning participation \[application of electrode to left tragus with stimulus intensity at that which is just below pain threshold for 35 min a day\] to ask about adverse events. At the end of 6 weeks, patients will complete these questionnaires again plus one assessing their assessment of treatment efficacy.
