I understand you are feeling low ... so yes go for drinks and lift yourself up. BUT your score reduction doesn't necessarily mean your file would be rejected. I know many cases where analyst did not / could not validate work experience and reduced the points and people still got PPR when the visa officer looked at documents. However, unfortunate thing is that the analyst has not made any comments on why he could not validate the work experience. It is possible he didn't even see the required documents in the first place.
So, once you are back from drinks and have had time to chill, think calmly. Gather all your documents and upload them via a CSE and then hope for the best / worst depending upon how you feel. I think you need to deliver one last punch (CSE) before you throw in the towel.
All the best!