Now I am 48 I wont bore you with all my ills

I have had a sore coxis the last few weeks.
It may be down to a pothole I never saw and took the full brunt on my derriere or the hard seats in the works canteen..

didn't bother me on the bike the other day but strangely it does when sat on the couch etc.
anyone else suffered this or have advice ?