Stomach Ache And Kidney Failure Helpp..is This My Kidneys?? Or Just In My Head..?

Helpp..is this my kidneys?? or just in my head..? - stomach ache and kidney failure

Ok, so my lower back and it hurts .. Kidney RYTE win ..
sick in the last 2 days Ive been with the stomach flu .. might help my back pain? and especially my lower back hurts when I do I'm sitting on this stupid computer chair, all former and other things, or if I'm looking for a while .. loooong than in my bed my bed Cuz It's .. old
I'm from kidney failure? or just over reacting?
What are other signs of renal insufficiency?