It sounds to me as if you are actually on the right track...
1. you're aware of the sin
2. you know the necessity to be reconciled
3. you strongly desire absolution
That's ALWAYS a recipe for a good result.
While you may feel a tremendous amount of remorse and guilt until you're able to get to confession, maybe it helps to look at that remorse/guilt as a bit of pre-penance. We all have crosses that burden us. Sin can hurt us in multiple ways. But I think you really should take heart that you will get to confession, that you'll make a good confession, that you will receive absolution and things will be right with the world.
Imagine how so much better you will feel once you hear the absolution!
In the interim, you may also find it helpful to recite an Act of Hope as often as find yourself in need of solace:
O, My God, relying on Thy almighty power and infinite mercy and promises, I hope to obtain pardon of my sins, the help of Thy grace, and Life Everlasting, through the merits of Jesus Christ, my Lord and Redeemer.Indeed, Hope is on the way for you, my friend.

And if it helps further, I have a feeling that what you experienced might be more common than you think. Don't believe that you are the only one on earth who has had a similar experience. One of my priests said in a sermon once that he has heard absolutely EVERYTHING in the box, with the exception of a confession to murder. I think if we non-priests were to know what is said in a confessional, it would be enough to curl our toes and strip the paint off a house. But Christ is already aware of all our sins, even those yet to be committed. It is up to us to do our part, to help us help ourselves, by availing ourselves of the sacrament of confession. The door is always there; we need only knock.