my great grandfather who is 80 yrs old (has suffered from stokes and cancer in the past) fell and hit his head last night. he falls alot! stubborn old man. this morning he went to a restaurant, was walking funny, complained of not being able to see out of one eye, say at the wrong table with people he didnt know and didnt even notice, blamed it on his vision,etc. he refuses to seek medical attention. what is his diagnosis? what should i do? i am VERY worried.