The being after I got Moderna vaccine I had a severe headache like I?ve never had before. It was more than just a headache, it was severe stabbing pain in the back of my head on both sides. Pain level was 10/10, it felt like I got shot 3 times in the back of my head. Turns out the vaccine for some odd reason attacked the nerves in the back of my head and I?ve had occipital neuralgia (nerve damage) severe pain in my head ever since, non stop.