You should make an effort to quit for good. 30-40 beers a week, blackouts, etc., these are all signs of out of control drinking. You're not going to be a "normal" drinker however you want to define that. You won't be able to control it either, at least never with any degree of certainty.
It has to be an all or nothing proposition in my experience, are you ready to give it up for good? Sounds like it has turned your life into a nightmare so why hang onto it, a clean bill of health for the moment doesn't mean much a few years down the road when your liver has been assaulted with the stuff a lot more.