for the file size that's a really small pic of what's going on... i can't even make out what the problems are... although from reading your problem i'd have to say that while you're sculpting you've gotta make sure you embrace undo as an essential option... set it to unlimited in the options, save every time you do something you're happy with, and make sure to save incrementally (if you save to face.mb and are happy with it, your next save should be to face01.mb... that way you know you didn't erase the positive progess you've made so far).