Hi shally0318
Yes your doc is partly correct about the cells if you've had a sub-total hysterectomy. Here is the information on this site:
https://www.menopausematters.co.uk/aftermeno.php"
Sub-total hysterectomy
If the main part of the uterus has been removed but the cervix retained, it is currently uncertain whether HRT can be given in the form of estrogen only or estrogen combined with progestogen. The slight concern of using estrogen only, is that there may be some of the cells of the lining of the uterus in the cervical canal which could become thickened from the estrogen. This thickening can be prevented by adding in progestogen. To find out if progestogen is required, it may be suggested to use estrogen combined with cyclical progestogen for 3 months after your operation. If there is monthly bleeding in this time, it means that cells are present which are responding to the hormones so estrogen and progestogen should be used thereafter. (These hormones can however be given together continuously to avoid monthly bleeding). If there is no bleeding in the first 3 months, then estrogen can be given on its own thereafter. "
Therefore you only need to use an HRT type with progestogen of some sort, initially for 3 months but then stop the progestogen part to see if there is a bleed. If there is not then you are safe to take oestrogen only according to the info.
This does mean until you have tested this on yourself, addition of oestrogen to the Tibolone could theoretically cause these cells to be stimulated excessively. It sounds like the option to go onto estradiol gel and Utrogestan might be a good idea at least temporarily on a cyclical basis as per the above. Then if no bleeding you are safe on oestrogen alone. You doc should know this I would have thought? It sounds like it is not definite that the cells will be there?
Maybe go for the new prescription and try it out as per the above (ie cyclically at first) and then take it from there?
Hurdity x