Why is your period last for more than 3 weeks head hurts an feel weak?

well, you might feel weak because your losing blood the more comes out the weaker you feel! hope it makes sense and it helps.

P.S.

at first it was like i was a noodle because i lost so much blood. but then i told my mom and she helped me. so tell your mom if this ever happens to you. its important that you tell. if you dont you could end up in the hospital.