Reading through this thread makes my consider wether it could be really the neck that is responsible for my symptoms. Since a rough bus ride 2 days ago my condition has extremely worsened. My main symptom is debilitating headache, meaning that I only start to feel something when I strained my brain too much. Does this also speak for a neck issue?

the other symptoms are slurred speech, tiredness, sleeping issues(including a bad twitching problem) dizziness, light and sound sensitivity, and extreme head sensitivity.

I haven't checked my neck yet, as the concussion was caused by a tennis ball that hit me on the forehead. Never thought that something like this can displace a vertebra.