OUCH Kazz, I know how you feel. I was involved in a car accident a couple years ago and I hurt my back, got no better and after several weeks I went for physio and manipulation etc.. and saw a chiroprator, and they said "you have slipped a disc"

WHAT I said, no problem I'll just manipulate it and BINGO it was in again! Lucky yes, it could of been much worse, I hope yours isnt. I have dreadful Sciatica now, sometimes worse than others. Honestly though, I walked out of physio sooooooo much more easily than when I walked in.
Hope your scan is done quickly, back pain is dreadful to bare, lets hope its very soon and you can have a pain free Xmas.
dawn.