Hello. I'm sorry you're uncomfortable. It isn't possible to determine what's going on here without a bit more information and an examination, but your symptoms are somewhat worrisome. If your cycle was returning, one wouldn't expect you to have pelvic pain
that is worse or different from the periods you had prior to getting pregnant. The "immense pain" in your stomach suggests that your injury
may have caused some internal damage or that something new is going on here, such as endometriosis
(which is a common cause of irregular vaginal bleeding
and severe pelvic pain). Endometriosis develops when tissue that normally only grows on the inside of your uterus
(i.e., the endometrium) begins growing elsewhere in your body, such as along your fallopian tubes or on your ovaries. It isn't unusual for women to develop endometriosis following childbirth -- some experts believe endometrial tissue gets pushed backward through the fallopian tubes during labor.
In any event, your pain warrants further investigation. I suggest you call your OB/GYN.
I hope things go well!