How do you alleviate guilt?

Sincerely apologize. Ask for God's forgiveness. Realize that you are a human being just like the rest of us and we all make mistakes. Don't continue to make the same errors. Once you've asked for God's forgiveness, let it go and don't ever bring it up again. It is over with at that point and God promises us that he will never bring it up to us again once we repent and seek forgiveness. A sincere apology goes a long way. Even if someone doesn't forgive you, you will be able to forgive yourself. Give yourself a pass but be very careful not to continue the behavior that caused the guilt in the first place.