are you eating a lot of protein? your symptoms sound similar to mine. like towards the right below my stomach i was getting some pretty sharp/bad pains. i thought it was my kidneys also but, it started happening when one night, i think i had too much protein. i can't remember exactly but, along with 8 oz. turkey sandwhich, i think i had some chicken also, and then i had 50g of protein shake, and then i had a cup of greek yogurt which may have been another 18g or 28g or protein. then while i was sleeping in the middle of the night i think i started noticing pains, and then i remember the next day while i was driving it started happening again.
the only thing i could connect it to was the protein because your kidneys have to process the protein. i've been watching it now and i'm not having a protein shake with a meal anymore, if i have a protein shake PWO i don't eat for 2 hrs. i had a feeling i was eating too much protein that night i was kind of thinking about it but, i just did it anyway. since i've been watching it, i haven't felt the pain that bad but, still sometimes i feel a little something.
i know on my last blood test my BUN was at 26 which is high out of range but, when it was in the 20's before and i discussed it here, people told me not to worry since typically BB's have much higher counts.
i was just on 400mg test cyp / wk (upped to 500mg just last week or so), this is my 9th week i think. not on any orals, or anything else.
i guess if you're over eating protein maybe try to back it down a bit and see if it helps. keep us updated if you go to the doc what happens because i may need to go myself to get checked out if the sharp/bad pains come back.