Good Morning.
You might want to ask your primary care provider for a referral to a provider that specializes in the spine and can address the SI related surgery (if it is contributing). Some ortho address but if the nerves in the back are involved, then you might need to consider physical therapy as your day-to-day work activities might be an issue as well as many jobs are not good for your back and core health.

"Once they fix one thing, another problem surfaces." Keep that in mind as you look forward to improving your health. If you need to back off to reduce symptoms, maybe the road to go.

I have had a few back problems and have partial sacralization. The PT helped me develop a program to alleviate almost all my symptoms. Work with your provider(s) ask questions, stay positive- you've got this!