My Father Is A Fairly Healthy 81 Year Old, Twice

My father is a fairly healthy 81 year old, twice retired, from AF and ROTC is married 63 years. Today my cousin said he saw my Dad have tremors, fainting with his legs buckling and hw caught him and helped him to a sofa chair. I came from outside and observed him for the "ABCs" and he looked, talked and sounded fine, even his temperament was characteristically himself. My father firmly sent me away saying he was fine. He had a 16 oz. water bottle in his hand. I reminded him to drink his water. He has episodes like this, without tremors, that I'm aware of. He drives, is fairly active, has slowly lost weight from 175 to 158 lbs., 6 ft, from past two years. He has yearly appointment in two weeks. He has had difficulty swallowing pills, some foods, lately. He was taking Nexium -- said it didn't help -- and cholesterol medicines, but stopped years ago. He has cirrhosis from heavy alcohol use; just ladt week he said he was hoing to stop some drinking; no smoking during lifetime; Mom is a lifetime, indoor smoker. Appetite is not great and he just started drinking Ensure, but loves meat though doesn't eat nor drink so much fruit and likes only some (one or two) vegetables, regularly with meals. He had exposure to Agent Orange. He takes laxatives every day and takes Ursodilol. He is adamant that I do not speak with his doctor about my observations and says I'm not a doctor when I work to tactfully encourage him or share thoughts or information that I read, when he brings events up on his own. Should I call his doctor against his wishes re my observations? How should I approach my father re his health? He is adamant about his wishes. Thank you, Doctor. Sherry Harris