since you wrote that ,it is affecting your daily activities,severe pain
. Better take an X-ray of spine to see if any fracture or just muscle sprain. Any of these would direct you to take good bed rest with proper medication and good spine support. You had head injury
, because of which one can have internal bleeding
,raised intracranial pressure and lead to nausea,headache,cloudiness,blurred vision
.immediately consult a neurosurgeon, as it is to be treated by surgical intervention.