My Dad who is 88, drop to my house as planned today but not responding to me. He looks fine but is kind of spacey. He said felt this way all day. When he got into the car, he noticed he had no shoes on. When he went back into the house, he left the door open. I have him sitting down relaxing drinking a coke (maybe low blood sugar). He said he had tried to sign a birthday card for a family member but wrote the wrong name. Is he having s stoke or heart attack? He is in no pain currently, just confused and can't talk to me but that comes and goes.