I lost my wife in February. We knew it was coming and were able to say goodbye. It doesn't hurt any less.

My wife left me an article series to read, in print, but it's also online, and it has proved helpful over and over again especially when I am in the deepest throes of agony. I hope it helps you and your wife:

"Help for Those Who Grieve" https://www.jw.org/en/library/magazines/awake-no3-2018-nov-d...

You'll benefit from the articles no matter your religious leanings. They are extremely practical.