I'm so sorry for your loss. I can't begin to imagine the pain. My own dad died just over a year ago and it was a terrible blow to me but it wasn't entirely out of the blue. That sent deeper into a spiral of drinking that I'm just now clawing out of. I hope you can walk away from the booze; I know first hand that while one thinks it's taking the edge off at the time it really just makes it worse.
Hopefully some of the resources linked here will help you. What a horrible thing to have to face. You have my condolences, and remember we're here for you if you need to talk.