Hebrews 9:27 says it is appointed for man to die once (and after that the judgment) this necessarily means people will suffer bodily (death is rarely without pain of one kind or another)
We are in a fallen world and as a result of the sin in the world there will be tribulation and trial (John 16:33) for us all, whether saved or unsaved (Matthew 5:45) although moreso for the saved it often seems. (Hebrews 12:6, 2 Timothy 3:12)
However, in the midst of it all God is with His people (Psalm 91:5-6) He has plans to help you, and not to harm you (Jeremiah 29:11).
You rail against God's love and comfort, shun HIS offer of patience and strength... but can you imagine dealing with this without hope, with no comfort? Without hope of heaven, of an eternity in the presence of a loving God for your wife? With only God's judgment for sin?
Be God's comfort to her, and lean upon Him for your own. These things must be, but your reaction - that's on you. God is faithful, even when we aren't (Thank God for that.)
I say this not as one who has never experienced this and more, but as one who has been there in the midst of worse than even you can imagine...