Two things:
Alcoholic Kindling - google it for more info, but basically each quit gets harder and harder. You may be able to "just quit" on your own this time, but next time might have to check into detox!
If you start drinking again, you will have to start over at the beginning, go through everything you have gone through, to get to where you are today. You will not progress to the easier and better stages, rather stay in the painful and difficult stages.....UGH!