Yes you do need a CT and that too in emergency. It is important to have an assessment of the vital structure, especially brain, inside your skull which could have been hurt during the hit. Since you fell conscious and are having headache, nausea
now so CT scan
Ear and the inner ear
are also lodged in the skull and are prone to internal injuries during head injury
. The clogging sensation may be coming from inner ear damage. For that too CT scan should give an answer.