I will try my best to answer your query.
It might be Post-concussion syndrome
. It is a set of symptoms that a person may experience for weeks, months, or occasionally up to a year or more after a concussion. Symptoms include headache, dizziness
sensitivity to light or noise, tinnitus
, insomnia, fatigue, nausea and vomiting etc.
I advice you to see Ophthalmologist, he will be in better position to advice you regarding your temporary blurred vision
Hope my answer will be helpful for you.