Speaking as a recovering alcoholic, this all sounds very familiar. My money is on he was off to go find somewhere still open where he could buy more booze. Alcoholics will drink until they can drink no more, no matter what scary situations they put themselves in. We can be particularly twitchy when we think other people are judging us or trying to control what we can drink. And then go off in a hump looking for a bar where there will be no judgement. That seems likely because he took his phone and wallet.
The paranoia and talking to imaginary people could be a number of things. The brain is a funny thing both when it’s detoxing and when it’s being drowned with alcohol, and you can get both short term and more permanent neurological issues that manifest this way. Sometimes it’s just being really drunk. Alcoholics are actually most at risk for harm when they’ve had a period of sobriety, and then relapsed, because they are used to drinking a certain way habitually, but having detoxed and been sober for a bit, drinking like they used to is much more dangerous. I believe it’s how Amy Winehouse overdosed.
My instinct is that he has gone on a bender and is holed up somewhere in a cheap motel. Or he has overdosed. The longer things go on though, unfortunately the more likely the latter starts to look. JMO
I’m a bit over 2 years sober now, btw. Very grateful for it.