Hi there I felt that way after finishing chemo. I didn't have radiation as I chose to have a mastectomy. I felt like I wasn't protected anymore in a way as the chemo treats the cancer does this make sense. ?? And when it finished I thought shit what now and as mine was triple negative I can take any other medication like tamoxifen etc so I felt a bit vulnerable but I finished chemo oct last year and feel the best I've ever felt now and don't they know about it much these days except for when my osteo plays up a bit and I think shit is that mets !!! But so far it's always been short term and far less frequent now and I hardly ever take any panadol osteo anymore. So it does pass lovey. Xx