My period is very irregular after haveing miscarrige in december 29 08 didn't have dnc ?

its been lasting about 3 weeks everytime I was hoping it would just kick back to normal but i hae been so drained latly i think it is taking the life out of me! i also have had a rough time in my relationship after having my misscarrige my b/f acted like it was not a big deal i have gotten over the fact that life happens but his disrespect has annoyed me! thanks doesn't feel like loving you today.............