The natural cycle is often dependent on many values including environmental, mental, and physical conditions of womon body. If one month is overflowing; which means (many things but one possibility is), "heat overacting the heart and small intestine", the simplest way to fix it is to cool the related channel, (the vital energy pathway). Menstruation in detail, is well developed area in Chinese Medicine over Traditional Western medicine; therefore, the "hard to treat" conditions can be easily fixable by Chinese Medical treatment. Acupuncture is the main method of treatment along with herbs, simple guasha and often times, cupping, (depends on the person's constitutional Qi), are applied for menstrual treatment. Consult with your local acupuncturist.