Is there any cure to the unpleasant life I feel after sin I have committed?

Only you can forgive yourself, and that unpleasantness will stay until you forgive yourself. It will stay for a while even after you forgive yourself. Unpleasantness goes away from understanding life..there’s no good and bad, doing some good or bad things doesn’t make us a good or bad person. What we do is an action, it doesn’t define who we are. Sin and feeling of unpleasantness is there to help you learn from it. You can decide that you won’t repeat it again and forgive yourself slowly over the time. It takes time. I’ve gone thru something similar. At times, i still feel destroyed, and i cry it out, i ask for forgiveness, i forgive myself again. It’s okay, we are all human beings. That’s how life is supposed to be. Our good or bad deeds dont define us. If you feel bad by a bad deed, then do some good deeds instead. That will help counteract that bad feeling. These are just some of the ways i know. :)