I echo what everyone else is saying. I've done the same damn thing while ill---we all have---and all I can do is let it go once I've made amends (or at least tried to). You just can't spend a year beating yourself up over something like this, you won't last in this life if you do. It's just too hard on the ego and your self-esteem.

Let it go. You've done everything right, and your professor still thinks highly of you. It's time to be at peace with it.