Upper back pain that is often constant, or can be sharp, like being stabbed, is characteristic for kidney problems.
The commonest causes for kidney pain are kidney diseases like kidney infection and kidney stones.
Pain due to kidney stones is very, very severe pain that comes on in spasms, and travels down to the groin.
Blood in urine and extreme fatigue are just some of the symptoms of kidney infection.
Chronic bladder infection can lead to kidney infection.
Kidney stones can be reason for kidney infection since they cause urine flow obstruction.
Also, kidney stones can result from kidney infection.
Abdominal bloating, abdominal discomfort with feeling tired are symptoms of fatty liver.

Ask for kidney x-ray or ultrasound examination!

Best wishes!
Marija