Hi, so sorry to hear of your problems, especially at Christmas I think that if bleeding occurs in the first 6 months of taking Tibolone, this is seen as normal, though of course it's best to get it checked out. It should mention something about this in the leaflet. I was on Tibolone for 18 months and started bleeding, and scans and biopsy showed thickening of the womb lining, which can happen with tibolone. Bleeding after 18 months is not great. The bleeding stopped as soon as I stopped taking Tibolone and after about 3 months off it the lining returned to normal. The Tibolone and bleeding could still be connected, but maybe others can advise better. The main thing is that you are getting things checked.
Sorry I can't help more, but I know how stressful it is. My anxiety was awful and it was so frightening. Just try and stay positive, though it's. not easy I know.