Hi, thanks for posting your concern in the HCM.
An altered sensation over face and light headedness several days after 
head injury warrant further investigation to rule out any internal 
brain injury or bleeding. You should at least have a non contrast 
CT scan of brain at the earliest.
If your report comes out to be normal, it would be a functional problem.
You may also consult a local 
neurologist to rule out any neurodeficit.
For any further advice I need the following information-
1. Your age and gender
2. Do you have any concurrent medical illness?
3. Is there any history of a cerebrovascular accident in the past?
4. Your present NCCT Brain report
For any further questions, you can write back to me directly. 
Regards,
Dr. Kaushik