Hi Amanda, I'm a recovering alcoholic with over 21 years' sobriety, and I'm here to tell you that you can do this!!
Getting and staying sober is the hardest thing you'll ever do in your life....but think of it this way, everything after that will be easy-peasy by comparison.
I was fortunate in that I got sober a couple of years before starting pre-nursing classes, and learned from the BON of my state that if substance abuse was no longer a problem for me, it wouldn't be one for them. And it never has been, even though I still get an urge to drink every now and again.
With me, ETOH was a form of self-medication for my then-undiagnosed bipolar disorder, and since I've been treated for it the cravings have subsided to the point where they're almost nonexistent. However, I still take responsibility for maintaining my sobriety and banish any thoughts of drinking FAST when they come along, usually only during times of severe stress. I did a lot of bad things when I was drinking and will spend the rest of my life making up for it, but that's OK. You have several years of a program to get through; at least there's an end to that, and I salute you for being proactive and volunteering to do it instead of the BON forcing you into it.
I wish you the very best as you face down your demons and work to keep your nursing license. Please keep us posted on your progress, and remember: one day at a time. Sometimes it's even one CRISIS at a time, one HOUR at a time, even one white-knuckled MINUTE at a time. But you can make it.