Help please ...

So I've been on my period for 7 days already and they're extremely heavy. Clots and all. And all of a sudden I got a rash all over my body. Kinda looks like a anemia rash. I'm going to the doctors for that cause I've been loosing a lot of blood and I feel drained and tired. It's rare for me to have heavy periods. This is my first time it lasts me 7 days. I'm on birth control. It usually lasts me 2-3 days. Maybe all the old blood is coming out ?? Idk what is going on with me.