Nuerological symptoms. Is the problem?

I did a yoga practice which involves hyper extension and hyperflexion of the neck simultaneously at a fast pace.Following the practice I had dizziness followed by a headache that is by far the worst headache of my life.it was like my head was about explode.The headache didn't go away with medication and finally I had severe nausea.After which I finally slept.The next day I had severe confusion and cognitive problems i.e.problems with analysing,reasoning,memory,clarity, imagination,understandingetc.However I continued the practice for somedays and the headache and the cognitive symptoms got worst only.i stopped the practice and stuck to generally exercises but Whenever I do any form of exercise I experienced the symptoms getting worsening only.Then later I developed ringing on on side of the ear,apathy,sensitivity to light and sound,then numbness in the body.i still have cognitive issues.so what exactly is the problem ?