had L-5 S1 BMP anterior fusion on june 20th this year, still experiancing same symptoms as before surgery, best way to describe is that my lower back only on left side seems to pop in and out of where it is supposed to be,pain is excruciating when it moves,noyhing in particular makes it better or worse. can be standing around holding a conversation and it can happen,when it does,i scream out with pain and go to my knees, also happens if on uneven ground, if i flintch or move anyway abruptly, hell it happens in my sleep too. any help would be greatly appreciated.