Hi Kristyfoster,
Bad to hear the pain has not improved your regardless the physio, injections and all those treatments.
The fact that muscle-targeted treatments have not improved your problem should direct focus on other structures such as the sacroiliac joint (SIJ) and low back. Aggravation of symptoms when loading while improving when unloading would support this theory. Mechanical and manual tests to analyse these structures may help undertand the source of pain and help your pain.
I suppose, however, that your physio has already thought about it
Let us know if your pain gets better