You have my complete sympathy....and let me tell you that you are not alone! My pelvis is out of alignment too - and will pop out of alignment within a couple of hours of being corrected. I've been told its been out of alignment for so long that there is no chance of it being corrected permanentlyI have a mild
scoliosis which I know is connected to the pelvis problem - what I don't know is which came first....no-one really seems to know.
It sounds like you are in the same situation - so its really just a case of trying to manage the pain rather than fix the problem. I still have regular physio sessions with a fantastic physio, but she doesn't even try to correct the pelvic alignment any more, she just does things like myofascial release and acupuncture to help with pain relief.
I hope you can find something to manage your pain - I know how miserable it is to be in pain all the time xx