It's hard. It's coming up on 6 months since the split with my stbxah, and I too still have days where I'm overwhelmed with sadness about the situation. I think leaving for 6 months sounds great to give yourself some distance. Do you have a plan to be able to continue with alanon while you're gone? There are online meetings, which I have found extremely helpful since I have 4 kids and can't get out on my own regularly.
Keep strong with your resolution for complete abstinence before you consider reconciliation. We all know that addicts cannot moderate, as much as we all wish they could. If my husband could have moderated ANY of his addictions then we wouldn't be in this situation, but whenever he cut back on one addiction another one would become an issue. He was just substituting one thing for another, not actually working on the problem. I wish I had seen that years ago.
This is the only relationship for me as well that I've had trouble letting go of. In other relationships I realized that it wasn't for me any more and had no problem being okay with moving on. I suspect it's hard this time because I know that our relationship itself isn't the problem, it's the addiction. If we didn't mesh, then it would be much easier to let go, it's the fact that the issues are because of other factors, and somewhere in the back of my mind because I don't have a problem not drinking/anything else I feel like it should be easy for him to just stop. Even though I know that's not the case.