Sorry you are having problems. I will throw out some ideas, though they may not be that helpful, since, like you, I am just another patient trying to figure this stuff out.
My first thought would be to try to pin down whether it is nerve pain from the spine, muscle pain, or nerve pain caused by a spasming muscle pinching the nerve as in Piriformis Syndrome. Piriformis Syndrome pinches the sciatic nerve, which can mimic nerve pain coming from the low back. Since the Piriformis muscle is traumatized (cut?) during surgery, it makes sense that it might cause problems as it wakes up during recovery. I believe that some doctors attempt to narrow this down by injecting something like lidocaine into different structures to see which injection site blocks the pain; then you know where to focus treatment. I will try to attach an article on Piriformis syndrome, but you should be able to easily find it online.
https://www.webmd.com/pain-management/guide/piriformis-syndrome-causes-symptoms-treatments#1In my own experience, I had some minor soreness when sitting for long periods after my first resurfacing with Dr Gross 10 years ago. The only time it bothered me was during long car trips, or when sitting on my waveski which has a very form fitting seat. This minor problem went away after about 18 months. If I had to guess, I would say in my case it was a spasmed muscle. Using a roller seemed to help a little. I am at five months on my other hip, and so far this problem has not shown up this time around.
Wishing you the best at finding a solution.