Our priest told this story once. So, I don’t know the origin.
There was a middle aged priest living in another country. One of his parishioners often would come to him and tell him that she was having visions of Jesus. Being a natural skeptic, he would hear her and gently dismiss her. One day, the self proclaimed visionary came to him and once again told the priest of her visions. To finally test the vision, he blurted out, “When next you see Jesus, ask Him what the mortal sin I committed in seminary.” It was a terrible guilt and weight that he had carried for years. The next Sunday the woman came to him and gave him the answer. “Jesus says that he doesn’t remember.”
At that moment the priest realized that he had been forgiven in confession long ago.
I like that story. When I am feeling guilty and ashamed of confessed sins, I pray, “I trust in Thee, Jesus.” Maybe the feelings are a good reminder to pray your trust in the mercy of God. Also, remember that emotions are not a sin. They are neutral. It is the response to emotions that can be a sin. So, if you respond to the emotion of guilt with a prayer of trust, I’m sure that God is very pleased with your response.