Safety and Efficacy of Non-invasive Vagus Nerve Stimulation in the Treatment of Headache in Subarachnoid Hemorrhage

The intervention consists of a transcutaneous non-invasive stimulation of the cervical branch of the vagus nerve (nVNS) using gammaCore, an FDA approved device for the treatment of migraine and cluster headache. This will be compared to the sham device, which is the same device which will not provide stimulation to the nerve. Stimulation frequency will be identical to the frequency used in previous nVNS studies for the treatment of migraine headache.