dear AnnieDC

You probably need to have your back checked again if it already has been...only positions that keep you straight seem to bring up your pain and flexed positions as you would in yoga and cycling ease it off...possibly L4/L5

what was the Wikipedia reference-linkMRI for? what was the ultrasound for? what where the steroid injections for? and what did the chiro,osteo and physios all have to say?
Burning at night? what positions are you lying when you get this burning pain?

sounds discy kinda...the other possibility is an Wikipedia reference-linkSIJ problem...

Does your pain stop you from functioning? what ADLs does it affect? any positions influencing it that you know? pain killers affect it?