At the end of last year, I was doing a flexibility class at the gym and the instructor pushed my back into a move which made a big 'click' sound in my hip and extreme pain the next day. About a week later I spent an hour or two sitting on the ground, and from that day forth I have had a constant issue with lower back pain. I went to the GP, who sent me for a scan to check for kidney stones, cysts etc but there was nothing revealed of concern. I have muddled my way since then, suffering flare ups and general constant hum of back pain. It regularly moves around and also shoots into my thighs. I am now seeing an expensive physio, who does provide (short term) relief and is concentrating on improving core strength etc. But I'm a bit worried that no one actually knows what's happened to my back - the scan was purely gyno and kidneys. To get the referral for physio, I rang the GP and he just wrote the letter without seeing me. Should I go back to GP, for any explatory something to find out what the issue is (could just be old age I guess, I'm 38) or just carry on with physio?