Hi, Cazjen.
Just a thought - after this length of time, could you ask your Consultant if the endo. is likely to return if you don't take a progestin or progesterone? If you got along with prempac and they are happy for you to trial estrogen only HRT, then of course Premarin is still very much available.
Another choice for you might be Tibolone - I know an endo. lady of your age who is post oopherectomy who has done quite well on this. I tried it post oopherectomy, but couldn't settle on it as it had components that turned out to not be compatible with my MS, which was undiagnosed at the time so of course this makes my experience rather unusual! xxxc