I have chronic low back pain but for the last

Patient: I have chronic low back pain but for the last few months I have been having this new pain. It feels like the same area my back normally hurts but concerned it could be flank pain. It comes and goes but has been more frequently lately to the point it’s daily on and off. Its a very intense sharp stabbing pain that takes my breath away. When the pain is happening the stabbing happens about every second, lasting about a second or 2. I’ve timed it. I’ve had kidney stones before but the pain was constant than. Not this throbbing like sensation where there’s horrible pain and then it stops only to happen again about 20 seconds later. This can go on for hours and then it will stop for a bit. Not sure what it is or if I should go to the ER. Please help! Thank you

Doctor: