Yes, ramps in all my stomach, pressure, pain in abdomen etc... I'm afraid
When did this start? Did you start something new, or increase a dose of anything, even if it was for detoxing?
Not that I don't believe you, but here are some possibilities that don't include your kidneys -
Could you be experiencing a lot of gas or constipation instead?
The liver is also nearby and we often experience pain and pressure when it's overloaded with toxins too - is that possible?
No matter what the cause is, it's obvious that you should speak with your doctor first thing Monday morning, unless they happen to have office hours today.
Hoping that you aren't in too much pain and discomfort!!!!