Hi! Your story is very similar to mine, so I feel your frustration. I was in a horrible car accident 6+ years ago and since then have fought debilitating headaches and a lot of the Chiari symptoms. In 2015, an orthopedic first mentioned the possible Chiari, and a neurosurgeon immediately shot it down, because the herniation was 3mm and started with an accident. The more I read about it, though, the more Chiari just seemed to fit what was going on. I went for a second opinion, and I was told it could not be Chiari because it started with an accident. No one could help me get better, though, either. I just went for a third opinion in Milwaukee and the doctor said it is Chiari. He spent over an hour examining me, looking at all of my imaging (priors MRIs, x-rays and his own), asking questions, answering questions, etc. He eliminated other possibilities and ultimately gave some suggestions and told me, I would be a candidate for surgery, but that was my decision for the if and when. He has created some of his own images and one showed a view from the brain into the spinal region, and it is very clear, how badly the right side is blocked. I went into the appointment not wanting him to say it is not Chiari because of 3mm or because it started with an accident, and I was relieved to leave there knowing that it has not all been in my head. My advice is to keep looking. I wanted to see this doctor, because they do a range of tests, so even if I had not received the Chiari diagnosis, I would have left there with some ideas about what was going on and what to do. When looking for another opinion, read the doctor’s site carefully to see what their thoughts on Chiari are (in your case, whether or not it can start with an accident) and what testing they do. The more thorough they are, the better they would be able to help. Good luck! This is not an easy path!