My Grandfather Is 82 And He Had A Stoke About

My grandfather is 82 and he had a stoke about 4 years ago. Both arteries in his neck had blockage and he had the surgery on one side (I believe it was the left). They told him the blockage in the other was 70% +/- blocked and to come back in a year to have it checked again, and he never went back. Last night he said his head felt "headachy" and he went to bed. He said his head still feels fuzzy, he's had watery bowl movements all day and is having some trouble with his balance. He hasn't fallen it's more like he's having trouble walking straight. My daughter and I just got over a virus, but the symptoms are not the same as his. I know you can't give me a diagnosis , but if you could just give me any kind of advice or what I may need to keep my eye open for I would really appreciate it. I apologize for wasting your time. I didn't know it cost