History of trauma followed by headache , dizziness
, confusion and unilateral (left sided ) weakness requires urgent evaluation to rule out intracranial injury.
Certain head injuries like subdural hematoma
can cause symptoms later as well so do not be surprised if your symptoms are appearing just now.
Since your predominant symptoms are left sided you might have sustained right sided head injury
Investigation suggested: CT scan
See your doctor at the earliest with the report.