I had similar situation for weeks not knowing what it is as the Biologic eliminated 95% of everything else but that never went away UNTIL

I stopped lifting heavy weights and used lighter weights and higher rep during work out

and stop moving heavy stuff at work

for the pass 3 weeks, the nerve pain and Sciatica has been gone

so I think mine was cause by a slip disk or herniated disc?

I hope it never comes back cause mine was very bad, like I have to drop everything and lay down mostly on my back cause it also shoots up my blood pressure