Thanks everyone,
@LouiseTurner you are right it is a massive decision and I'm annoyed at myself as I've had 5 months of chemo to consider it but was going with the lumpectomy and have just recently turned my mind to masectomy. I now need to decide fairly soon as they will operate in about 4 weeks.
It's interesting as my medical team have said that a masectomy is not required and chance of recurrence in the breast is low, however I keep hearing about people getting a new cancer in the other breast or same one sometimes 15 years later. My medical team also said they deal with the facts and don't take into account the emotional side of ongoing fear of recurrence and I need to work out can I live with being called back for biopsies in the future etc. What I find difficult is to imagine myself In the future when I'm not as consumed by breast cancer and how I would cope with monitoring my breast etc.