Good afternoon,
I am sorry to hear about the position that you are in. My first suggestion would be that you read through the information on the drink drivng.org site to understand the charges a little more. I would then urge you to contact a solicitor directly to discuss the case in detail.
Based on the information you have detailed above, if you have been charged with drink driving and the lowest reading was 66mg on the evidential breath test machine, the starting point on the sentencing guidelines would be a driving disqualification of between 17-22 months and a fine. The sentence would also depend on if there were any aggravating features in the case. The disqualification can be reduced if you are offered the drink drive rehabilitation course, which would afford you a 25% reduction on the length of the disqualification.
A motoring law specialist will be free to talk to for initial advice, once they know a little more information about you, and then the appropriate advice can be given to you.
I hope that helps