Please, don't go to the bar. It WILL get better. This harsh self-judgement is a trick used by the drink to 'beat you' in to submission and drinking some more.
I have found that within DAYS of stopping drinking my mood lifts so much that I stop looking back at what I have done and look forward to what I can do. The positive 'vibe' kicks in and I realise I am NOT the hopeless case alcohol wants me to believe.