I am sorry you are experiencing so much pain. I am facing similar surgery of T10-S1. I have interviewed at 5 surgeons and they all told me that it can be a recovery period of up to one year. However, other people who have had this surgery have reported relief of the pain you described immediately after surgery. Much of the pain post op was mostly the surgery scars healing and regaining muscle strength. Can you describe what the pain is that seems to interfere with your sleep and ability to sit or stand for any length of time? Is it radiating numbness in the legs, muscle spasms in your back or something else? My pain today is mostly pain in my thighs and spasms in my lower back, leg weakness and difficulty standing or walking for more than 10 minutes.
Why did your surgeon go from T11-S2? My recommendations are to correct a slight curve in the lower thoracic and correct narrowing of the spinal canal at L3-5. I hope your physical therapy helps with relieving the pain.