I am a big girl 24 5'6 430 lbs haven't had a period in like 1 and half yrs always been heavy what could it been and i grow hair on my face?

Check it out: Lack of periods can occure with excessive weight that causes imbalance in the estrogen/ Progesterone balance. Hair could be from excessive testosterone . See your doc.

Get treated now: This is probably stein-leventhal / polycystic ovary / Insulin resistance tied up with your obesity. Your situation is extremely dangerous and i would urge you to consider inquiring about bariatric surgery, as well as removal of unwanted hair. Please get counsel about diet and exercise.