hello dear thanks for writing
since any major issue which could have caused these symptoms is ruled out by normal
MRI i think you are having an attack of migrain,
also do let me know if you feel like
vomiting, if headache increases when outdoor and relieved in dark.
migraine is very common and usually, involves one side of the head and very severe lasting for several hours to days.
i would recommend you to take painkillers like
aspirin, ibuprofon ,
codeine or their combination for few days
try staying in dark room avoid going outdoors.
i would also recommend an opthalmic consultation to rule out other causes of blurring of vision.
hope this was helpful please let me know if you have any further queries
hope you get well soon.