How did you hit your head - forehead/frontal, sideways, top of head, back of head?

The severe pain you describe is not usually a PCS issue, some mention headaches, neck pain, but not like you describe..
Trigger points can cause some pain & referred pain.. but rarely to severe levels..
what were the scans they did? - xray, MRI, CT scan?

Sometimes things get missed or they don't show up , I hope a dr requests new imaging, if pain is this severe..