Crippling cramps & heavy bleeding

Jamikah • Anime lover 🧡 Hentai Fanatic 😏💛 26 & Living my life 🤩
 I have the most crippling cramps when I'm on my period & I always bleed heavily, when is the best time to call the doctor? I've been experiencing these symptoms for as long as I can remember, but to be more specific I was 13 when it started to get painful.
Has anyone ever experienced these problems? If so, what did you do? How do you manage it? 
Mines gets so bad that I can't get out of bed until the pain goes away & that could be hours.