Dear Feelingverylow,
I think that part of why you are struggling right now is that you are separated from God, from Truth. It is hard to feel a sense of peace and forgiveness when you are separated from God. I believe that once you confess to your wife, you will begin to feel that peace. Of course you will need to care for her and of course she will have emotions, responses, and actions that are uncomfortable and wrenching to you, but I believe that if you stay close to God in prayer, ask for wisdom and ask to feel his love for you, you will have it. But you don't have it now because you are separated.
I think Psalm 77 will help you, and I will write it out completely so you don't even have to go looking for it :) You will notice that the psalmist is deeply troubled in the beginning - "my soul refused to be comforted." This is where you are right now. You are troubled and restless because he wants you to move from the place you are in right now and you will keep being troubled and restless (unless you work hard to numb yourself, please don't do that). And notice how the psalmist brings himself out of his self-absorption, by meditating on the works of God. We have all the work that he did for the Hebrews to meditate on, and we can meditate on the work of Jesus, and the works of God in our own lives, to help us move from self-absorption into worship, where we will find comfort and strength. Notice the detail with which he remembers God's work, the many lines he spends pondering and meditating. This is a path for you when the weight of what you have done feels crushing.
(Thank you WoodThrush2, I will gather up your praise and lay it at his feet where it belongs. By myself, I am a wreck).
Psalm 77
My voice rises to God, and I will cry aloud;
My voice rises to God, and He will listen to me.
Int he day of my trouble I sought the Lord;
In the night my hand was stretched out and did not grow weary;
My soul refused to be comforted.
When I remember God, then I am restless;
When I sigh, then my spirit feels weak.
You have held my eyelids open;
I am so troubled that I cannot speak.
I have considered the days of old,
The years of long ago.
I will remember my song in the night;
I will meditate with y heart,
And my spirit ponders.
Will the Lord reject me forever?
and will He never be favorable again?
Has His favor ceased forever?
Has His promise come to an end forever?
Has God forgotten to be gracious,
Or has He in anger withdrawn His compassion?
Then i said, "It is my grief, That the right hand fo the Most High has changed."
I shall remember the deeds of the Lord;
I will certainly remember Your wonders of old.
I will meditate on all Your work,
And on Your deeds with thanksgiving.
Your way, God, is holy;
What god is great like our God?
You are the God who works wonders;
You have made known Your strength among the peoples.
By Your power You have redeemed Your people,
The sons of Jacob and Joseph.
The waters saw You, God;
The waters saw You, they were in anguish;
The ocean depths also trembled.
The clouds poured out water;
The skies sounded out;
Your arrows flashed here and there.
The sound of Your thunder was in the whirlwind;
the lightning lit up the world;
The earth trembled and shook.
Your way was in the sea
And your paths in the mighty waters,
And Your footprints were not known.
You led Your people like a flock
By the hand of Moses and Aaron.