It depends how heavily you have been drinking. I've had problems with substance abuse in the past and drinking. But the thing is, stopping drinking won't kill you (I'm not a doctor, just my opinion).
That's why when doctors say "Are you sure you should stop cold turkey? You may have a stroke." I call bullshit, because unless you are drinking hard liqueur from the moment you wake up, to the the moment you go to bed, every single day, then it's highly doubtful.
Even if you do what I just said, it's still unlikely. This is all from my own personal experience. You will just feel anxious for a few days and a bit shakey more than likely. I would check yourself into a inpatient detox for a couple of weeks, if you have never detoxed before OP. The thing is, unless you have the right mindset/support when you come out, you will go straight to the bar when you come out.
The reason I suggest this even though I think it's pointless, is because they will give you Valium to make sure you don't have a stroke or anything, if you are really that worried.
As for rehab, that is someone's personal choice, and unless you have actually been there yourself, I wouldn't just tell you OP that it's bullshit etc. That is terrible advice. How could you possibly know that if you don't have an addiction problem and have never been to rehab yourself?
Bottom line - you need a decent therapist who will work with you on your own mental issues as to why you abuse whatever it is before you even consider going to rehab.