Welcome to HCM.
Since you have already had an ultrasound
scan ( and I hope you have done a transvaginal sonography
) and the report is bulky uterus
, it is most likely to be Dysfunctional uterine bleeding
If the bleeding is not controlled by medicines then you will need a D & C.
I suggest you consult your gynecologist and she will do the best for you.
Wish you all the best.