Your period has a prolonged cycle & less of bleeding since last 6 months.
If it comes without any medication,& stops on it's own, more possibility of hormonal
imbalance as a causative factor.
You need to get routine blood work to rule out anemia/ other debilitating diseases , A pelvic sonography
to assess ovarian function, a hormonal assay to pin point the cause.
An expert gynecologist can thereafter be consulted for management of the problem.