When someone mentions back pain, along with peeing... My thought goes to kidney stones...
Quote:
Small stones can cause some discomfort as they pass out of the body. Regardless of size, stones may pass out of the kidney, become lodged in the tube that carries urine from the kidney to the bladder (ureter), and cause severe pain that begins in the lower back and radiates to the side or groin. A lodged stone can block the flow of urine, causing pressure to build in the affected ureter and kidney. Increased pressure results in stretching and spasm, which cause severe pain.
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However, since you don't seem to be in severe pain, in some instances the pain has been described to that of childbirth...
Might it be that you are getting back pain from your mattress? If it happens in the weekend, you are spending more time in bed, so you might feel the effects of a mattress not giving you full support.