I've not read every reply here so apologies if I'm repeating stuff, (and if it seems like I'm preaching

). However, I had raised ALT during blood tests for my routine post-40 health test in January. Apparently they were double what they should have been, (and at 10x is when you'll have acute hepatitis). I feel absolutely fine otherwise, and I've read that 90-100% of regular drinkers will develop this and fatty liver to some extent.
I've not completely stopped drinking but I have now restricted myself just to Fridays and Saturdays. With one completely alcohol-free week a month, (I work on-call 24x7 one week every month so that is actually a big help in abstinence).
The recommendation does seem to be taking regular complete breaks from alcohol - say 4 days a week to allow liver recovery. Despite the government warnings about binge drinking, a lot of liver doctors seem to think that if you're going to drink at all, do so all at once and then allow the aforementioned 'recovery' period.
Not trying to scaremonger here but I read a case of someone, mid-40s who collapsed without warning and tests revealed severe liver damage. Apparently he'd only drink ½-1 bottle of wine a day - but had been doing so every day for over 20 years without a break.
I'm sure you'll be fine mate. Probably just our bodies reminding us we're no longer spring chickens and to take it a bit easier.