What Causes Headache, Stomach Ache And Vomit Sensation?

my daughter said she hasnt been feeling well for the past month. she said her stomach hurts, she has head aches sometimes, she feels like shes going to throw up but when she go into the bathroom but doesnt throw up, her back just started to hurt like very very bad, she is losing weight, sometimes she is dissy, and she has a small bumb on her stomach. Do you know what the problem is?