Experimental: Active

This is a non-randomized, non-blinded study. Participants eligible for this study will receive active treatment. Dual Sympathetic Blocks of the stellate ganglion are minimally- invasive outpatient procedures performed under monitored care anesthesia (light sedation). Under ultrasound visualization, a small needle is guided into the neck region that contains the stellate ganglion nerve cluster at C6-C7. Once the needle position is confirmed, a local anesthetic (7 cc of 0.5% bupivacaine/Marcaine) is injected around the stellate ganglion by the Principal Investigator. This procedure is repeated at the C3-C4 level to block the superior cervical ganglion nerve cluster (3 cc of 0.5% bupivacaine/Marcaine).