Fiona - The guilt after drinking can be crippling but try to be good to yourself. We have all relapsed before and all you can do at this point is figure out how to not let it happen again.
My last drunk was so shameful that thinking back on it makes me not want to drink. Without going into details, it was a terrible night. In addition I have to stay in the day and when I have a craving I pray and come here to SR.