I had the stellate ganglion block performed at the Stanford Pain Management Clinic. It led to a slight improvement in my sense of taste, but other than that, it didn't do anything. I only had one side blocked, but I know the block was performed properly because I experienced Horner's Syndrome. In the days that followed, my Long COVID heart symptoms (chest pain, palpitations), which had mostly gone away, returned with a vengeance. Thankfully, they were short-lived and went away again after a few days. Initially, I had planned to try a second block, but after that experience, I didn't bother.