Can postpartum depression cause impulsiveness and/or serious anger with depression and anxiety? if so, what is the best well known way to help treat it?

You should see the doctor that delivered the baby ASAP. Good Luck

It is not feasible to provide an opinion without additional history, physical examination may be some tests. It would be prudent to see your doctor. Depression is treatable. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!