First... the person takes a drink.
Then, all too often... over time... the drink takes the person.
Kimmy, the human body becomes 'accustomed' to the effects of alcohol, the body builds toleraces, the body discovers 'likes'... the body wants more, and so does the mind. Both change.
I like the suggestion from Smacked...
"Why don't you try not drinking for a month or two and see if things settle out for you a bit? You might find some answers during that period of time."
It could be a very learning experience.
Keep coming back.