Recently Had A Mastectomy In 2017. Currently, Have Bone Metastatic

recently had a mastectomy in 2017. Currently, have bone metastatic which was dx in December 2017. I had radiation on the left side because of lymph node involvement in 3 nodes. Due to neck pain, I was in hospital July 2 - 6, 2018. I was told in hsp that I have a disk that maybe herniated. Told by drs. in hsp. not a part of cancer. I am now being told that cancer is in neck. I am very uncomfortable to two totally different diagnoses.