The blood supply to the ovaries can be interrupted with the removal of the uterus. Thus, until a new, good blood supply is established, the ovaries may not function quite properly leaving you with not quite the right amount and balance of hormones. Some symptoms of PMS, like breast swelling and tenderness, can be a result of hormonal imbalance--specifically, estrogen dominance.
Additionally, many of us used some type of hormonal treatment prior to our surgery, such as birth control pills to help with bleeding issues, and those hormones may have helped keep some PMS issues in check. Following a hysterectomy, we are back to just us and our own hormones and it isn't always pretty!
The good news is that things do tend to settle down after a few months, though PMS can persist for years to come. I am right at 10 years post op and some months for me are worse than others. At times I tell my DH not to even look at me because I am so swollen and sore. Other months are no big deal at all. But initially, I was pretty miserable!
You could try avoiding foods high in plant estrogen like soy, yams, sunflower seeds, etc. (You can do a web search to find a list of foods.) Sore, swollen breasts can occur from estrogen dominance so adding to your estrogen level with those foods could just compound the problem. Using natural progesterone cream might also help. Some ladies also have success with Vitamin B6 and other vitamins and supplements. The last suggestion my doctor offered me was a low dose birth control pill.
For right now, Advil/Motrin and cold compresses might help you feel a bit better along with wearing a very supportive bra.
Don't hesitate to talk to your doctor about what you are going with and see what suggestions s/he may have for you!
Gentle
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