Hi Colin, oh please do not consider surgery at all....at least not now, at least not until you have looked at these other options very very seriously.
I have heard and seen too many tragedies with those who've listened to surgeons. It is irreversable if they screw up, and they often do.
Doctors were drooling to get at me with the blade, but my sister-in-law sent me that book, and within 5 days I was on a steady healing path. I could feel the difference in 3 days (and I had been in bed for 6 weeks out of 8!)
We are designed to heal if given the chance. If you look at that website and even call to question Egoscue's knowledgeable people, you'll find that there are literally scores of people, far worse off than you are now, who came to complete healing via the excercises.
I feel for you...ouch!./...by back twinges just thinking about your situation. But please know that you not only have hope, but LOTS of it! :-)
WIth Egoscues method you will experience relief very quickly (no laying in bed 3 weeks, that's for sure), and with SFQ for the long-term, you have every reason to expect a bright future.
All the best to you,
RC