A book that helped me through a lot was Getting Them Sober. It’s not what it sounds like, and it’s a super easy read. It might help you get in a better headspace before you get to April.
Best wishes to you and your wife. It is such a difficult situation to be in because it’s clear that you care very much. I hope you find peace. She won’t be fixed by April, as you know, but I hope you can make your decision (whatever the outcome) with peace.