I have no experience with large snakes nor have I been bitten before, but I know how you feel. When I got bit by my female BP a long time ago (during feeding time, completely my fault) I was scared to hold her again because I didn't want to get bit, but I knew if I didn't she would turn into a mean snake, and that meant my favorite and most docile snake I've ever owned would not be able to be handled. So, I handled her a few days after, and she was as nice as she always has been. I handle her frequently too, and she's still that docile snake.
When you clean/handle that snake again, show no fear. Even though the bite was painful, it was by accident because the snake thought it was being fed. I'm sure that won't ever happen again, only if your careful. When you go in to clean out the enclosure, spot clean, change water, etc., make sure you know where she is and where her head is, and when you do always watch to see what she's doing just in case she's trying to make a move to bite you again.