Be careful with the fasting if your losing blood - or at least take a supplement like immunace or something similar. Science and spirit can over-lap in a helpful way. Within Daoist teaching I have read that some women can 'stop' all blood-flow on a permanent basis through an act of will. However, this is usually older women who are over forty (and looking beautiful to my mind). My Western friends often react with incredulity when I casually mention this practice - but it's all in the context of the situation. As these women are approaching the menopause - they simply align their intention with the unfolding physical reality.