Either ovulation or (more likely) the function of your brain that triggers ovulation could cause endometrium that migrated to your abdomen before you had your uterus removed, to swell and be painful. Removing the uterus would not necessarily do anything to remove strayed endometrial tissue, unless you had a really good surgeon who knew how to look for endometrial tissue attached to other internal organs and structures. It can be widespread and kind of subtle. (Having a hysterectomy is not the usual occasion where a specialist goes looking for endometrium attached elsewhere, he or she is usually just focusing on doing a hysterectomy.)
In your shoes, I would try to find a specialist who is really good at this kind of surgery. (In my town, it was the specialist who did IVF, a reproductive endocrinologist, I think.) It could mean another surgery, but if someone who knows what he or she is doing will do your laparoscopy and get the endometrium out that is not supposed to be there anyway, you will feel a whole lot better. It's either that, or go permanently on the pill to keep from having a period kind of bodily response, or wait until menopause.
As far as I understand it, how it was explained to me when I had my hysterectomy many years ago, estrogen feeds the endometriosis, so since you still have one ovary, you can still have endometriosis if, as Annie said, they left even one small piece in there. Leaving you with one ovary makes sense, given your age and the benefits of your body making it's own estrogen, but a recent study shows that removing ovaries can reduce the need for more surgeries and lessen the chances of recurring pain.
https://www.verywellhealth.com/endometriosis-after-hysterectomy-3156908 - a summary of the study
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4286861/ - the actual study
Obviously, there are a dozen (or more) other things that could be causing this pain, and the "migrating" pain could be radiating pain, which starts in one place, but travels to another, most often along a nerve path.
I hope you get some answers! Let us know. :)