neuromuscular - many thanks for your replies. When you say 'ASIS landmarks on your pelvic bones' , can you tell me exactly where these are? Sorry for my ignorance!!

This may well be the problem, because one of my physios did say that my pelvis was 'twisted' - the left side backwards and the right side tilting forwards. She had tried to manipulate my pelvis and gave me exercises to try to get it to 'hold' in place but this didn't work, so I was discharged yet again.

I must say my feeling is that the pain is coming from the pelvis rather than the spine (even though both doctors I've seen seem to think it is caused by a bulging disc!)

Anyway, I have now had an Wikipedia reference-linkMRI scan and am waiting for the results to come back - maybe (hopefully!) I will have a better idea of what is going on once I get the results.

Thanks for your continued interest and advice.