And don't worry too much! What will be will be. I'm sure you've learned from it already! Everyone makes mistakes, and just remember that you are a tiny minuscule/minor case to the magistrates. They see a lot worse on a daily basis and drink driving is not what they are most interested in.
It is serious because it is a crime, don't get me wrong. However in the grand scheme of things, it's not that bad. You might feel like a murderer when you go in, but they don't really look at you like that. They'll be more concerned about the wife-beater about to appear, or the rapist coming in after that. It's just a slap on the wrists to them...just has more of an effect on your life because driving is important to you, as it is for everyone. But we all manage when we can't drive
You're one of the lucky ones just remember that. You get to walk in the front door of the court as a member of the public, and you'll get to leave in that way too! You'd be a lot more scared if you were taken away in cuffs, placed in a sweat box and driven to one of Her Majesties delightful imprisonment centres! But that won't happen so you'll be fine!
If you haven't already, feel free to glance through my experience of court and what I went through and what I thought helped/might not have helped. I blew 82mg and received a 12 month disqualification and a £625 fine. My ban was reduced to 9 as I completed the awareness course and I have 2 months and 20-something days until I can drive again. I think the way you come across in court has a lot to do with what they hand down punishment-wise.
http://www.forum.drinkdriving.org/have-you-been-caught-convicted-drink-driving/39561.htm
Hope that link helps a bit & I wish you the very best of luck! Be sure to come back tomorrow when you know more!