Hi and welcome to HCM.
It sems like there is some hormonal
imbalance which causes abnormal bleeding,YOu should do hormone blood levels and pelvic ultrasounds to evaluate is there any ovarian pathology. Period problems can be treated by hormonal therapy but you should know the exact cause for right treatment. ALso if you have light blood there might be blood clotting disorders so also do prothrombine time and clooting factors tests just to be sure. WIsh you good health.