Oh Kate, I'm so sorry you have been left feeling like this. Go back to your oncologist and ask them to explain to you about the surgical margins and the intentions of the treatment you have received. Can you contact the breast care nurse (often easier to contact them and they can track down information or doctors on your behalf), your oncologist or your GP? Do you have a follow up appointment with the radiation oncologist? Your concerns about the lumps you have felt need to be addressed. You don't have to wait until your next mammogram to have the lumps you have felt investigated. A physical examination by your doctor is a start. Take care.