Please Help! I really need it!?

Ok. So I got my first period like 6 months ago. It was fine like I didn't get cramps or anything but it lasted 28 days. Then on my next same and again. Then it stopped stopping like it didn't stop. Well it stopped like 20 days ago and has stayed stopped but yesterday I got it again and it hurts so bad I have cramps and my flow is so heavy that i am filling up an overnight pad in like 30 minutes. i wore a tampon and in bled threw a tampon, pantyliner, underwear and jeans. I hurt so bad. What should i do. has your period ever been this irregular?