Heavy periods, big clots, cramps hurt to breathe and been on and off birth control and still no relief is this normal?

No: This is definitely not normal. You need an exam and a visit with a Gyn doctor; endometriosis is one possibility, there are others. Make an appointment, get help. Good wishes.

No: Not normal. There are a lot of possible causes ranging from a bleeding disorder to a missed pregnancy. Go see your doctor or Ob/Gyne. You need a check up and maybe some test to check your bleeding.