What to do with an uncle who drinks to much?

My Uncle like to drink,point blank.I love going to visit him,at the same time I totally do not look forward to it.You see my Uncle is an alcoholic.When he drinks he does not have a care in the world.I was visiting him and sick One night.I was sick and throwing up in the toilet maybe two-three times in an hour.My Aunt said I think she is sick.My uncle said shes fine.My Aunt said no,I think she is really sick babe.I was throwing up and my Uncle yelled at me to keep it down.I then went to go lay on the couch. went to sleep.The next day after work my Aunt told him about the way he was acting he night before.My Uncle said no way I acted like that.I mean when we ask him to play games he is to busy on the computer.When he drinks he will be on there all night.I remember one night my laptop crashed,so I asked him if I could go on for a sec just to check my email.e said no I am on it.My Aunt was like sorry about him.I told her it was not her fault.The thing is my Uncle has a lot of health problems.He hs diabetes and should no be drinking with.It lowers his blood sugar to the max.He just does not are.One night he ped out because of his blood sugar drooping.there were other nights when he ped out from littlerly drinking.He also has heart problems caused by his drinking.Is there anything we can do for him?Do you have any advice