Thank you for the advice.
I have a drinking diary already which shows my ups and downs. 1 actually means a booze-free day - 0 means I was drinking. (attached file)
In that period in May, despite my success, productivity, health benefits etc, I'd say I was pretty miserable - even towards the end of it. Maybe I just didn't go long enough?
In August when I controlled the drinking I was very happy - but unfortunately the fact I've now lapsed shows that this apparent temperance is unreliable.