That doesn't sound pleasant at all, Smatchimo. I'm glad you're about to get health coverage so you can go see about yourself. Wish you would go on in beforehand.

Let me ask you a few questions from the bible of paramedicine, Brady Emergency Care. Does it feel very similar--only a whole lot more severe--to one of those "stitches" in your side when you're running or doing aerobic exertion? Or is the pain slightly different? If it is different, how does it differ?

Does moving or changing positions ease the pain or change its nature? Normally with one of those running pains, stopping the exertion, raising your arms over your head to stretch out the chest walls and abdominal oblique muscles, and taking some deep breaths will make the pain go away. Does anything like that make a difference with these pains?

Which side is the pain on?

Where's the pain centered? Is it centered in the area of your kidney sort of in the upper portion of your lower back and around to the side? Or is it someplace else.

Does the pain go away completely sometimes and then come back again, or do you always have some version of it?

It's impossible to diagnose severe pain remotely, which is why it's important for you to get to a doctor. Be prepared for them to ask you similar questions to these. My guesses would be perhaps a kidney stone, some sort of intestinal problem or possibly appendicitis, a spasming muscle, or a back/nerve problem.