Thank you both for your responses, I'm def going to make an appointment with my GP.
DCIS or Ductal Carcinoma in Situ is a type of breast cancer, confined within the milk ducts, mine was detected very small and very early and treatment has been a success. Although they can't make you stop HRT they don't recommend it as there very little info on the type I had and HRT. I came off it under my own steam but I feel progressively worse, before I was confident, happy, now I constantly second guess myself.