Best wishes thoughts and prayers.
Back surgery is one of those things that seems scary (especially when it's your back) but those procedures have been refined and repeated so many times that the likely hood of anything seriously bad happening as a result is very slim. Still...if it were my back I would be concerned. If you found a good reputable doctor then you have most of the concern out of the way.
I believe you'll be back here soon commenting on how well it all went and how much better you feel. Please keep us updated. With any surgery like that it might take awhile to heal but soon after all is better.