How do you know that you have a problem with your drinking? When is it plain to see that you are engaging in excessive drinking?
If you have unsuccessfully made an effort to quit drinking or if you sworn to yourself that your drinking days are gone and then you realized that you were drinking excessively [...]

How do you know that you have a problem with your drinking? When is it apparent that you are engaging in abusive drinking?
If you have ineffectively attempted to quit drinking or if you have given your word to yourself that your drinking days are over and then you were made aware that you were drinking [...]