What do i need to do to make my hair stop breaking mid shaft?

Well first I will tell you that grad school is the main contributing factor to stressful hair loss. Try a heavy leave-in conditioner but if you can't afford that then try using mayonnaise about an hour before you shower and don't towel dry because that pulls hair out too; just wrap it with towel and let it dry naturally. You should see some improvement in a short amount of time.