We went through a very similar situation in second grade. We started counseling with a psychologist who specializes in behavior modification. She recommended a book called The Whole Brain Child and its companion book No Drama Discipline. Things got better almost immediately. I highly recommend a good counselor coupled with the wisdom found in Dr. Seigel’s books. Hang in there, mama, you got this! I also would respectfully disagree with the suggestion that you consider Bipolar disorder. I think 8 years old is far too young to consider a diagnosis such as that. But a good psychologist will do wonders to help you navigate this difficult time.