Thoughts that can trigger anger include personal assessments, assumptions, evaluations, or interpretations of situations that makes people think that someone else is attempting (consciously or not) to hurt them.
What increases our body's oxygen? Aerobic exercise is any exercise that increases the level of oxygen in the body. This exercise, whether it be breathing more, walking, jogging, cycling, dancing, or swimming, conditions the heart and lungs to work more efficiently.
Make sure you're listening to your body and not overdoing it. Increase exercise around your period, which will improve oxygen circulation throughout the body. Eat lots of fresh fruits and vegetables, whole grains, and lean protein. Avoid lots of salt (but use spices, especially spicy ones, liberally).