| The cervix which is the mouth of the uterus can sometimes close up, not allowing blood to come out. This usually happens in response to infection, to a tumor, or due to any injury at this region.
In your case, it is likely that the GVHD set up an inflammatory reaction at the cervix and /or lower part of the uterus, closing it up and preventing blood from flowing out.
Cervical or endometrial cancer is another possibility causing your cervix to get blocked.
Your doctors are carrying out the right treatment. The cervix should be opened up again if possible. If not, the uterus will need to be opened up as in a cesarian section and the blood drained.
Once the blood is drained, a D&C will need to be done to get a little endometriumfor a lab test.
The main problem is that the condition may recur. To prevent recurrence, once the cervix is opened up, an intrauterine contraceptive device will need to be put in to prevent the two walls of the cervix and uterus coming in contact and closing up again.
You will also need to continue the estrogen patch as well as use estrogen cream vaginally to encourage the growth of the endometrium (the inner uterine lining). A healthy endometrium will prevent closure of the walls.
If this does not help, you will need to get a hysterectomy - removal of the uterus.
I hope this helps. Please feel free to ask a follow-up question if you need more information.
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