Hello Sir, I Am Arshid Latif From Pakistan. I Am

Hello Sir,
I am Arshid Latif from pakistan. i am 35 years old spending married life. my weight is almost 54 kg. from the last 6 months i feel back pain specially in bottom back bone. i also feel pain in my kidneys as well, so please tell me that this pain due to my kidney or because of weakness. after attending a toilet its difficult to stand quickly or easily.
please advice..
Regards