Congrats on a great choice. Two days is HUGE. My advice? Don't think about tomorrow, next week, next month, etc. We'll deal with them when they get here. ALL you need to focus on is today...right now...this 5 minutes. Because that's all that matters.
Don't worry about the past...what's done is done. Fuck it. Don't worry about the future...it ain't here yet. Fuck it. Quitting is done one day, one hour, one minute at a time. Craves last about 5 minutes...unfortunately, they happen EVERY 5 minutes early on...but they will pass. Come up with strategies to fight craves. I suggest drinking tons of water, push-ups, take a walk, pop on this site and click around in the Quit Groups and realize every name you see there was once where you are now. YOU CAN DO THIS!