Hi Henry,
I have a left BHR and a right THR, BHR is 7 years old and has less running on it than yours but still up to 30k, and slower because I am 70 but still trying to race 5k every week. I have always been able to feel my BHR hip but not painfully, my THR is generally unnoticeable but since June 1st I have had sciatica and could barely walk for a month. If I did not know better I would have thought the THR was failing but its actually my spine (L4/L5 vertebrae) causing the problem. Being stretched on an IDD machine has improved things to allow running and walking again, and walking really well, but there is still an impingement on the nerve which is taking ages to resolve. Maybe you have a back problem after all the ultra pounding you have experienced?
Good luck on finding a resolution. If your metal ions are ok you can’t have worn your BHR out…
Pete