Hi Ima,
Everyone feels lonely sometimes. Even people who don't have a problem drinking. Sometimes people just get blue. Here's the trick. Healthy people have learned how to comfort themselves and either figure out to do something to pull themselves out of it or just accept that's how they feel at the time but it will pass so it's still okay even though it's not great.
I'm learning this one myself.
I think this is just part of learning to live without alcohol. Great job on 4 days. Just keep looking forward and trust you won't always feel this way. Try different things and see which ones help pull you out of it. Even if it's just for an hour.
Hang in there.