Sickness

hi my name is therese, My mother was diagnosed in may of endrometrial cancer, she got her operation in june they did a radial hysterc, and took the ovaries and part of the cervix,also lymph nodes she went on to have 5 weeks of radiation treatment in november. in the last few weeks she has been feeling tired, very nausea, and terrible pains in her spine and lungs? she is very worried that she mite be dying. does anyone know what them systems relate to?