You poor love, that sounds excruciating. Acupuncture is perfectly safe in pregnancy and very effective on back injuries of all kinds. You can also see an osteopath for very gentle treatments which, like the acupuncture, aid your birthing potential not detract from it. I strongly recommend that you seek many other opinions because surgeons, perhaps not surprisingly, have a tendency to recommend surgery way more often than is necessary. There is no way anyone can know at this stage in your pregnancy how you will be at term, especially if you address your issues through other modalities and reduce or clear them. If you have a back problem, a big slice through the muscles which help support your back, as well as the massive risks associated with ALL c-secs not only emergency ones, won't improve your capacity to have a healthy back at all. Sounds like your issues need much more holistic treatment than a surgeon can provide.