I've decided to answer this as some other problem drinkers might be reading.
They told me in recovery that drinking's like getting into a lift that only goes down - a long, long way down. Conditions get worse the longer you stay in it.
I was fortunate to have got out on a fairly high floor. We were all doing well to have got out of the "lift to the bowels of the earth" at any floor - a lot of people don't, it crashes at the bottom and they die in hell. Some twits get back in after leaving the lift.
I had one backslide during my sober year, and it helped me to remember that I'd just got back in the bloody lift after struggling up the stairs for months. I got out again.
Why was I on a higher floor when I exited this metaphorical lift? Despite the phenomenal amount of wine I was drinking, I had no withdrawal symptoms. I was able to go a few days without it, and arrived at the clinic sober - they breathalysed me and did a blood test. I missed my wine and was annoyed at having to drink water with dinner, but I was there to learn how to make this my normality. Some of the others really suffered in their first week.
Sticking with the lift metaphor, you could say getting pissed one night takes you one floor down. The climb back to the beginning is the hangover.
Some people don't bother to tackle the stairs; they just get back in the lift (drink again) and they keep getting out, deciding not to take the stairs, and hopping back in again, going a few floors further down each time. These are people who insist they can handle their drink and don't get hangovers - because they never make the effort to stay out and climb up! Eventually they'll just carry on drinking, staying in the downwards lift while it takes them to the bottom.
Rehab & recovery support you to climb the metaphorical stairs from whichever floor you're on. There's still no upward lift; it's going to be a hard slog. So it's best to either not drink at all, or to make sure you only go a tiny way and leave space in your life to get back up.
It sounds like OP takes a small trip in the 'Downward Lift of Forget-Your-Troubles' once in a couple of weeks, giving herself plenty of time to recover and rebalance. Her everyday life's pretty tough, and climbing a few more stairs on the Sunday probably feels like a fair trade for a bit of Saturday relaxation.
Apologies for the really long metaphor - it meant a lot to me!