I would be on pins and needles as well, but it sounds like you are taking care of yourself first and preparing for two possible scenarios, one good, one potentially bad. Building up that trust factor again takes time and it has been building up based on your h's progress. This is a difficult time of the year and the places where he is going tonight sure doesn't promote sobriety with temptation lurking about, but it is out of your control the decision he chooses on his night out.
My thoughts and vibes are with both of you...