<s>[INST] Hello, yesterday I had my first set of nerve blocks for chronic pain. For the last 3 hours I have felt nauseous, like I ve got something tied around my neck, migraine type pain around my right ear radiating down my neck, I am cold (temp is 35.2) but forehead and neck warm too touch [/INST] Hi, Without an exam, I can only give general information. AND it depends a lot on where the nerve block was. If it is where the pain starts, well, that would imply an effect of the shot like hitting a nerve. If the shot was in the back and the symptoms are in the neck, however, it COULD be a leak of spinal fluid BUT, it is at least as likely to be a plain tension headache. I cannot say in your particular case, but generally, this would be reasonable. Hope I have answered your question. Let me know if I can assist you further.  </s>