I have bilateral flank pain.  It started over a year ago. It will come and go.  It starts as a dull ache, radiating into bilareal pelvis.  It increases quickly from a dull ache to a sharp, throbbing pain.  It will start, I medicate with 600 to 800mg of ibuprofen.  Lately, I have to take 650MG of Tylenol WITH the ibuprofen to get it managable.  These attacks will last 3 to 6 days and not happen again for one to two months.  Each bout seems to be more intense.
Hello I have gone through your question and understand your concern. Chronic bilateral flank pain can originate from kidney, spine, muscle spasm, conditions affecting organs in abdomen and very rarely cardiac causes. Undergo the following test for better diagnosis, ultrasound abdomen and pelvis along with ECG, X-ray lumbosacral spine, complete urine examination, liver and kidney function test. Avoid taking heavy painkillers, only to worsen the problem if renal or liver pathology is the cause for pain as most of painkiller process in these organs. Use hot pad or pain relief ointments for local application if the above diagnostic tests are normal, in that case muscle spasm is likely to be the cause. Hope your concern is answered. Thank you.