Should I pray and fast, or refrain from doing so, if menstrual blood with all its characteristics and symptoms appears seven days after the cessation of my menstrual period, even though there are signs of purity, knowing that I suffer from polycystic ovaries and anemia?

The blood that reappeared to the questioner after seven days of purity, if it was after fifteen days had passed from the beginning of the previous menstruation, then it is istihadah (definition) (non-menstrual bleeding). However, if the total days of the previous menstruation and the seven days of purity are less than fifteen days, then the returning blood is considered menstruation, as long as its total, combined with the previous menstruation and the days of purity thereafter, does not exceed fifteen days. If it exceeds fifteen days, then the excess is istihadah.