Irregular menstration such as amount of blood or time between periods? Periods and menstrual cycles are never the same; sometimes, women may bleed for a few days then stop, only to start once more later. I don't think that this is anything that could cause concern or require medicine, but I don't pretend to be a doctor, or a specialist in any way. If you feel that this irregular menstration is cause for concern, consider seeing your doctor and possibly and OB-GYN.
Depends on the cause. Could be a hormonal imbalance in your ratio of estrogen to progesterone, and there are natural remedies that can attempt to address this, but it can also be a sign of other things, such as a thyroid problem.