question: This morning at approximately 2 am I had acute severe, (almost unbearable), pain mid/lower back on both sides. I could feel what felt like my kidneys physically throbbing with my hand placed over them. I was literally doubled over in pain and no position I tried made it any better. I honestly thought I was going to pass out. I was so nauseated that i almost threw up from the pain. It radiated around my sides to the front side during the episode. After about 30 min it started easing up. I have had a constant dull achy pain along w/the nausea since then. It gets a little stronger for a few seconds at a time and returns to the bearable achy pain. I will say that the pain at its worst is comparable if not a little worse than when I gave natural childbirth. What could this be?