don;'t be a slave to what some system or philosopyy or theory says you must do, listen to your body!!! thats a good thing to do in my opinion, it knows what it needs.
now technically its not a fast becaue you will be digesting protein, but whatever, if you really think it will help, i say go for it and see what happens. if it works, wonderful! if not, then cross it off your list of options, you won't know if it will work unless your try.