Milk makes me extremely ill, i am not lactose intolerant. could this be genetics?

Lactose intolerance: When you say it makes you "extremely ill" it would be helpful to know what you mean by that. If you are developing symptoms such as bloating, flatulence, diarrhea or abdominal distention, it is likely that you have the condition. If not, you should go see your doctor before entertaining a possibility of genetic disorder. http://www.laendo.net/english/lactose-intolerance-31309766.