Whilst I am not FJ I have am Rotary Pongo pilot whom had prolapsed disc op and returned to flying albeit I was grounded for a year. It was specified at the time that were I FJ (Ejection seat) I would not return to that role but more harrowing was the news that I might over time make the whole matter very messy and maybe unoperable if I continued to leave it go unsorted.
I would recommend the MRI that was suggested on an earlier post and make the best decision from there.