Don't make any hasty decisons.
There are lots of implications of losing your licence... that will far outlast your understandable feelings of guilt.
I used www.roadtrafficlaw.com based in Glasgow in Scotland and was very pleased with the defence of my drink driving case in Scotland. My career was on the line and I can't tell you how relieved I was.
I've just looked at their site for the first time in ages and they have added a series of videos on drunk driving with advice and information on all aspects of the procedures and what to expect.
Take a look and then find out what's involved. I think you might be pleasnatly suprised and they may be able to stop a ban as well as your embarrassment.: http://roadtrafficlaw.com/road-traffic-law-scotland/
Hope it helps