I definitely understand what you are going through. It is great to get second and even third opinions. There is also research information on the internet and doctors on You Tube - Mayo and Seattle Science Foundation. I have been fused C3-C7, T2-S1 and Si joints. The area i would also ask about is your si joints. Some people when they are fused in the lower lumbar also have si joint issues later. Some doctor's will take care of this issue with the lower fusion. Keeping your core and back muscles strong will also help you long term.